[go: up one dir, main page]

US673099A - Range-finder. - Google Patents

Range-finder. Download PDF

Info

Publication number
US673099A
US673099A US3512300A US1900035123A US673099A US 673099 A US673099 A US 673099A US 3512300 A US3512300 A US 3512300A US 1900035123 A US1900035123 A US 1900035123A US 673099 A US673099 A US 673099A
Authority
US
United States
Prior art keywords
frame
mirror
movement
rack
base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US3512300A
Inventor
Nicholas Tobin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US3512300A priority Critical patent/US673099A/en
Application granted granted Critical
Publication of US673099A publication Critical patent/US673099A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C3/00Measuring distances in line of sight; Optical rangefinders
    • G01C3/10Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument
    • G01C3/12Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument with monocular observation at a single point, e.g. coincidence type

Definitions

  • Tn Noam: PEYERS co, PNOTO-LITKO" wAsnmm'cu, a. c.
  • n4 NORRIS PETER-S QQ, pnuvoumm wnsummou. n. c.
  • NICHOLAS TOBIN OF PITTSBURG, PENNSYLVANIA.
  • the invention described herein relates to certain improvements in range-finders whereby the distance of an object of an observer may be accurately and quickly determined.
  • the invention has for its object a construction of apparatus whose medial length is a factor of the base of a triangle, the angle at the end of the base of said triangle opposite that at which the apparatus 'is located having a fixed or constant value regardless of the distance of the object, and the angular movement of the member of the apparatus actuating the dial mechanism shall be proportional to the change of angle at the apex of said triangle'for every variation in the distance of the object observed.
  • Figure 1 is a plan view of my improved apparatus in open position.
  • Fig. 2 is an end elevation of the apparatus, the parts thereof being in the same positions as in Fig. 1.
  • Fig. 3 is a sectional elevation of the apparatus.
  • Figs. 4 and 5 are detail views of the mechanism for shifting the frame.
  • Fig. 6 is an enlarged view of the dial-actuatin g slide and its shifting mechanism.
  • Fig. 7 is a plan view of the dial-actuating mechanism and its controller.
  • Figs. 8 and 9 are sectional elevations on planes indicated by the lines V'III VIII and IX IX,
  • Fig. 7; and Fig. 10 is a diagrammatic viewillustrating the operation of the apparatus.
  • a frame 2 is pivotally mounted. Both the bed plate 1 and the frame 2 are preferably made rectangular in shape and equal in dimensions, as shown in the drawings.
  • Frame 2 is caused to turn around a center by any suitable driving mechanism interposed between the frame and bedp1atesuch, for example, as that shown, consisting of pinions 4 4, which are mounted .on the under side of frame 2, en-
  • gaging racks 5 mounted on the upper side of bed-plate l.
  • the frame and bed-plate are provided also with guides 6 6 and 7 7, which engage one another.
  • Two mirrors 8 and 9 are mounted upon the bed-plate 1,one of them, as 9, being so supported on a post 3, whose axis coincides with the center of movement of the frame, as to be in a plane passing through the medial line of the apparatus.
  • the mirror 8 is secured on the bed-plate in front of the mirror-9 and parallel therewith and with its reflecting-surface facing the mirror whose reflecting-surface faces the object to be observed.
  • the mirrors 8 and 9 are so arranged with reference to each other that rays of light passing immediately over the upper edge of mirror 8 are received on mirror 9, reflected to mirror 8, and
  • mirror 9 is placed higher above the bedplate 1 than mirror 8 and inclining mirror 8, as indicated in Fig. 2.
  • Mirror 9 is provided with a sight-mark or preferably with a small spy-glass 13, placed at the middle of its upper edge. This spy-glass is provided with spider-lines, which of course serve as a delicate sight-mark. 3
  • the two mirrors l0 and 11 are so arranged with respect to one another on the frame 2 that when the instrument is closed one of them, as 11, will be in a vertical plane passing through the medial line of the apparatus and the mirror 10 parallel to the medial line of the bed-plate 1. They also are arranged face to face and so inclined thata ray of light from the object whose distance is to be that when the instrument is closed mirrors 8 and 10 shall lie in substantially the same plane and form one practically continuous mirror and that mirrors 9 and 11 shall lie in substantially the same plane and form another practically continuous mirror.
  • the mirror 11, which is pivotally mounted on frame 2, is provided with an index, which may be the pivotal end of the mirror 11 and is so situated as to be reflected in the surface of mirror 10.
  • frame 2 is pivotally mounted on bed-plate 1 and that mirror 11 is pivotally mounted on frame 2. These two pivotal points are placed, as shown, at the extremities of the medial line of frame 2. Means are provided by which when frame 2 moves on its pivotal point 3 mirror 11 also moves on its pivotal post 15 away from mirror l0, and the rate of motion is definite, as will be hereinafter explained.
  • Anaxle 17 is mounted in suitable bearings 18 18, secured to the bed of the frame 2. Upon this axle pinions l9 and 21 are mounted.
  • Pinion 19 is adapted to engage a rack 22, fixed on bed-plate 1. This rack 22 is in the shape of an arc of a circle and is so placed that post 3 is the center of that circle.
  • Pinion 19 is preferably made slightly conical, so as to travel accurately upon this arc-shaped rack.
  • Pinion 21 engages a rack 23, which is rigidly attached to mirror 11 and is movable in guides 24 24, mounted upon frame 2.
  • Rack 23 is also arc-shaped and is so placed that the pivotpin 15 is at the center of that are.
  • Pinion 21 also is preferably slightly conical in shape, so as to travel accurately upon rack 23. It will be understood that by adjusting the relative sizes of the two pinions 19 and 21 and by adjusting their positions upon axle 17 with respect to one another and the position of the racks 22 and 23 it is possible to vary the rate of movement of mirror 11 upon its pivotal point with respect tothe rate of movement of frame 2 upon its pivotal point to any desired extent.
  • the sliding rack 25 is provided at one end with a spur 27, which is made of such a length that its point will, when the rack has been shifted to its extreme outward movement, be immediately above or in alinement with the center of movement of an arm 28.
  • This arm has its inner end pivotally mounted on asuitable support, such as the guide 26, on the frame 2 in suitable relation to the line or path of movement of the rack 25 and has its outer end connected to a slide 29, arranged at an angle to the line of movement of the rack 25.
  • This slide is mounted in guides 30, secured to the under side of the frame 2, and is provided with a ledge 31, having its edge toothed to engage a pinion 32, forming a part of a train of gearing for operating the indicating-fingers.
  • the slide is also provided with a ledge 33,011 which is mounted the mechanisms for shifting the slide back and forth.
  • shifting mechanism consists of pinions 34, loosely mounted on drums 35, so as to be rotated on the drum in one direction, but connected by pawls and ratchets to the drums when the latter are driven in the opposite direction by their actuating-springs 36.
  • the drums are held from rotation by means of brakes 37, normally held against the drums bysprings 38.
  • the brakes can be shifted and held out of contact with the drums by fingers 39, which are accessible through the bottom board of the frame.
  • the fingers are held depressed by means of spring-catches 4O engaging projections on the fingers.
  • Th'e pinions 34 intermesh with a rack 41, secured to the under side of the frame 2, and their driving mechanisms are oppositely arranged, so that one of them will shift the slide in one direction and the other in the opposite direction.
  • the arm 28 is provided on its inner edge with a rib 28, the inner face of which will coincide with a plane passing through the center of movement of the arm.
  • the inward movement of the arm and also that of the dial-actuating slide 29 is regulated by the position of the spur 27 on the rack 25. As the rack is shifted by the frame the movement of the indicating-dials will be proportional to the movement of the frame.
  • the pinions 4, which are employed for shifting the frame back and forth, are drawn by spring-actuated drums 35, similar to the construction heretofore described.
  • the rotation of the drums is controlled by spring-actuated brakes 37, which are moved away from the drums by handles 43, which are preferably located at the edge of the frame and connected to the brakes by rods 44, as shown in Fig. 1.
  • These driving devices are oppositely arranged, one being employed to move the frame and the other to shift it to closed position.
  • my improved range-finder I take a triangle, preferably a right-angled triangle, having a base which is a multiple of the medial length of the apparatus or the distance between the pivotal center of the frame and the pivotal center of the mirror 11 and whose apex is at the object-as, for example, if the apparatus has a medial length of two feet the base of the triangle will have a length of seven hundred and twenty feet or any other length of whichtwo is an exact divisor.
  • the mirrors 10 and 11 which might properly be termed focusing-mirrors, are so arranged and shifted in relation to each other that when the images of the object and the indicator on mirror 11 have coincided in mirror 10 a given point on the frame will have moved an angular distance from a given point on the base-plate, said. points coinciding or registering one with the other when the mirror 11 is parallel with mirror 9, such angle having a certain fixed relation to the angle at the object or at the apex of the triangle having the given'baseas, for example, in the construction shown the edges 0. and b of the frame and base-plate coincide or register with each other and when the instrument is closed lie in a plane passing through the center of movement of the frame and may be taken as reference-points, above referred to.
  • the apparatus has been sighted on the object by mirror-s8 and 9 and focused by shifting the frame, as above described,
  • the edge a, of the frame will be at an angle to the edge b of the baseplate, and the apparatus is so constructed that the angle a c b will have a certain fixed relation to the angle at the apex of the right-angled triangle. It is preferred to so construct the apparatus that when focused the angle will equal the angle 10, 0 p at the apex 0 of the right-angled triangle, whose base is a multiple of the medial length of the instrument.
  • the frame 2 in'its movement shifts the spur or stop 27 a'distance proportional to its angular movement.
  • the position of the spur 27 determines the movement of the slide 29, which actuates the indicating mechanism of the apparatus.
  • the indicating mechanism is so constructed in accordance with rules known in the art that for every'chango of position of the frame 2 the dial will indicate the corresponding change in the distance of the center 0 of the apparatus to the object.
  • a range-finder having a medial length which is a factor of the base of a right-angled triangle in combination with a member movable on a center, which forms one terminus of the base of said triangle, a distance-indieating mechanism controlled by the movable member and focusing mechanism for determining the range of movement of the movable member, substantially as set forth.
  • a range-finder having in combination two movable mirrors arranged so that the image of an object will be reflected from one to the other, means for shifting said mirrors one at a greater speed than the other to bring the image of an indicating-mark reflected in one mirror into indicating relation to the image of a distant object reflected in both mirrors, and an indicating mechanism operated in accordance with the movements of the mirrors, substantially as set forth.
  • a range-finder having in combination a base, a frame pivotally mounted on the base, a mirror secured on said frame, a second mirror pivotally mounted on the frame, means for shifting the frame, means shifting the second mirror independent of the frame and an indicating mechanism movable independent of but controlled by the movement of the frame, substantially as set forth.
  • a range-finder having in combination a base, a frame pivotally mounted on the base, a mirror mounted on the frame, a second mirror pivotally mounted on the frame, means for shifting the frame, connections from the frame to the second mirror whereby the latter may be shifted at a greater speed than the frame, and an indicating mechanism operated by the frame, substantially as set forth.
  • a range-finder having in combination a ICC base,aframe pivotally mounted on the base,a ent rates of speed, a slide operated by the mirror carried by the frame, means for shiftframe, a stop carried by the slide, a springing the frame, a second mirror pivotally actuated slide and an indicating mechanism [5 mounted on the frame and movable thereby, operated by the slide, substantially as set 5 a stop device operated by the frame and a forth.
  • a ran e-finder having in combination a base, a fran ie pivotally mounted on the base, a NICHOLAS TOBIN 10 mirror carried by the frame, a second mirror Witnessesi pivotally mounted on the frame, means for F. E. GAITHER,

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Mounting And Adjusting Of Optical Elements (AREA)

Description

Patented Apr. 30, IBM.
-N. TOBIN.
RANGE FINDER.-
(Application filed Nov. 1. 1900.)
R W A m z G v u". mfiv M W 8 6h 1- 8 H m s M o n w n.
Tn: Noam: PEYERS co, PNOTO-LITKO" wAsnmm'cu, a. c.
No. 673,099. Pafented A r.'3o, I90l.
. N. TDBIN.
RANGE FINDER.
(Applicltion filed Nov. 1,' 1900.)
(No Model.) I 1 4 Sheets' Sheet 2.
n4: NORRIS PETER-S QQ, pnuvoumm wnsummou. n. c.
No. 673,099, Patented Apr. 30, MN.
N. TOBlN.'.
RANGE FINDER.
(Application filed Nov; 1, 1990.) (No- Model.) 4 Shoets-Shoet 3.
5 1x532? I. I I 3 I I I Atty.
THE NDRRJS PETERS cu. Pwo'm umo" WASHINGTON. o. c.
(No Model.)
Patented Apr. 30, I90I. N. TOBIN.
RANGE FINDER.
A lic ti n filed Nov. 1, 1900.)
4 Shaets$hoot 4.
INVCETOIR An'y.
THE uonms PETERS c0., PNOTO-L XTHDY, WASNINGYON, u. c,
UNITED STATES PATENT OFFICE.
NICHOLAS TOBIN, OF PITTSBURG, PENNSYLVANIA.
RANGE-FINDER.
SPECIFICATION formingpart of Letters Patent No. 673,099, dated April 30, 1901.
I Application filed November 1, 1900; Serial No. 355123. (No model.)
To all whom, it may concern:
Be it known that I, NICHOLAS TOBIN, a citi= Zen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered certain new and useful Improvements in Range-Finders, of which improvements the following is a specification.
The invention described herein relates to certain improvements in range-finders whereby the distance of an object of an observer may be accurately and quickly determined.
The invention has for its object a construction of apparatus whose medial length is a factor of the base of a triangle, the angle at the end of the base of said triangle opposite that at which the apparatus 'is located having a fixed or constant value regardless of the distance of the object, and the angular movement of the member of the apparatus actuating the dial mechanism shall be proportional to the change of angle at the apex of said triangle'for every variation in the distance of the object observed.
The invention is hereinafter more fully described and claimed.
In the accompanying drawings, forming a part of this specification, Figure 1 is a plan view of my improved apparatus in open position. Fig. 2 is an end elevation of the apparatus, the parts thereof being in the same positions as in Fig. 1. Fig. 3 is a sectional elevation of the apparatus. Figs. 4 and 5 are detail views of the mechanism for shifting the frame. Fig. 6 is an enlarged view of the dial-actuatin g slide and its shifting mechanism. Fig. 7 is a plan view of the dial-actuating mechanism and its controller. Figs. 8 and 9 are sectional elevations on planes indicated by the lines V'III VIII and IX IX,
Fig. 7; and Fig. 10 is a diagrammatic viewillustrating the operation of the apparatus.
1 is the bed-plate or base, which may be conveniently mounted upon a stationary support, such as a tripod. This bed-plate or base remains in a fixed position in respect to the object the distance of which is to be deterv mined after the apparatus has been directed to the object in the manner which I shall hereinafter explain and which is the first'step in determining distance with my improved apparatus. Upon this bed-plate 1 a frame 2 is pivotally mounted. Both the bed plate 1 and the frame 2 are preferably made rectangular in shape and equal in dimensions, as shown in the drawings. Frame 2 is caused to turn around a center by any suitable driving mechanism interposed between the frame and bedp1atesuch, for example, as that shown, consisting of pinions 4 4, which are mounted .on the under side of frame 2, en-
gaging racks 5 5, mounted on the upper side of bed-plate l. The frame and bed-plate are provided also with guides 6 6 and 7 7, which engage one another. I
Two mirrors 8 and 9 are mounted upon the bed-plate 1,one of them, as 9, being so supported on a post 3, whose axis coincides with the center of movement of the frame, as to be in a plane passing through the medial line of the apparatus. The mirror 8 is secured on the bed-plate in front of the mirror-9 and parallel therewith and with its reflecting-surface facing the mirror whose reflecting-surface faces the object to be observed. The mirrors 8 and 9 are so arranged with reference to each other that rays of light passing immediately over the upper edge of mirror 8 are received on mirror 9, reflected to mirror 8, and
.again reflected, so as to pass immediately over mirror 9. This result is best accomplished by placing mirror 9 higher above the bedplate 1 than mirror 8 and inclining mirror 8, as indicated in Fig. 2. Mirror 9 is provided with a sight-mark or preferably with a small spy-glass 13, placed at the middle of its upper edge. This spy-glass is provided with spider-lines, which of course serve as a delicate sight-mark. 3
The two mirrors l0 and 11 are so arranged with respect to one another on the frame 2 that when the instrument is closed one of them, as 11, will be in a vertical plane passing through the medial line of the apparatus and the mirror 10 parallel to the medial line of the bed-plate 1. They also are arranged face to face and so inclined thata ray of light from the object whose distance is to be that when the instrument is closed mirrors 8 and 10 shall lie in substantially the same plane and form one practically continuous mirror and that mirrors 9 and 11 shall lie in substantially the same plane and form another practically continuous mirror. The mirror 11, which is pivotally mounted on frame 2, is provided with an index, which may be the pivotal end of the mirror 11 and is so situated as to be reflected in the surface of mirror 10.
It has been stated that frame 2 is pivotally mounted on bed-plate 1 and that mirror 11 is pivotally mounted on frame 2. These two pivotal points are placed, as shown, at the extremities of the medial line of frame 2. Means are provided by which when frame 2 moves on its pivotal point 3 mirror 11 also moves on its pivotal post 15 away from mirror l0, and the rate of motion is definite, as will be hereinafter explained. Anaxle 17 is mounted in suitable bearings 18 18, secured to the bed of the frame 2. Upon this axle pinions l9 and 21 are mounted. Pinion 19 is adapted to engage a rack 22, fixed on bed-plate 1. This rack 22 is in the shape of an arc of a circle and is so placed that post 3 is the center of that circle. Pinion 19 is preferably made slightly conical, so as to travel accurately upon this arc-shaped rack. Pinion 21 engages a rack 23, which is rigidly attached to mirror 11 and is movable in guides 24 24, mounted upon frame 2. Rack 23 is also arc-shaped and is so placed that the pivotpin 15 is at the center of that are. Pinion 21 also is preferably slightly conical in shape, so as to travel accurately upon rack 23. It will be understood that by adjusting the relative sizes of the two pinions 19 and 21 and by adjusting their positions upon axle 17 with respect to one another and the position of the racks 22 and 23 it is possible to vary the rate of movement of mirror 11 upon its pivotal point with respect tothe rate of movement of frame 2 upon its pivotal point to any desired extent. In practice Iso adjust these pinions and their racks that the angular movement of mirror 11 shall exceed the angular movement of frame 2 (which is the same as the angular movement of mirror 10) bya certain definite amount and that this excess of movement shall be a relatively small fraction of the angular movement of frame 2. A third pinion 20 is secured upon the shaft 17, so as to engage a rack 25, which is mounted in aguide 26, secured to the under side of the frame 2. As the shaft 17 is rotated by the shifting of the frame 2 the movement of the rack will be proportional to the movement of the frame, the proportion being dependent on the relative sizes of the pinions l9 and 20. The sliding rack 25 is provided at one end with a spur 27, which is made of such a length that its point will, when the rack has been shifted to its extreme outward movement, be immediately above or in alinement with the center of movement of an arm 28. This arm has its inner end pivotally mounted on asuitable support, such as the guide 26, on the frame 2 in suitable relation to the line or path of movement of the rack 25 and has its outer end connected to a slide 29, arranged at an angle to the line of movement of the rack 25. This slide is mounted in guides 30, secured to the under side of the frame 2, and is provided with a ledge 31, having its edge toothed to engage a pinion 32, forming a part of a train of gearing for operating the indicating-fingers. The slide is also provided with a ledge 33,011 which is mounted the mechanisms for shifting the slide back and forth. A desirable construction of shifting mechanism consists of pinions 34, loosely mounted on drums 35, so as to be rotated on the drum in one direction, but connected by pawls and ratchets to the drums when the latter are driven in the opposite direction by their actuating-springs 36. The drums are held from rotation by means of brakes 37, normally held against the drums bysprings 38. The brakes can be shifted and held out of contact with the drums by fingers 39, which are accessible through the bottom board of the frame. The fingers are held depressed by means of spring-catches 4O engaging projections on the fingers. Th'e pinions 34 intermesh with a rack 41, secured to the under side of the frame 2, and their driving mechanisms are oppositely arranged, so that one of them will shift the slide in one direction and the other in the opposite direction.
The arm 28 is provided on its inner edge with a rib 28, the inner face of which will coincide with a plane passing through the center of movement of the arm. The inward movement of the arm and also that of the dial-actuating slide 29 is regulated by the position of the spur 27 on the rack 25. As the rack is shifted by the frame the movement of the indicating-dials will be proportional to the movement of the frame.
The pinions 4, which are employed for shifting the frame back and forth, are drawn by spring-actuated drums 35, similar to the construction heretofore described. The rotation of the drums is controlled by spring-actuated brakes 37, which are moved away from the drums by handles 43, which are preferably located at the edge of the frame and connected to the brakes by rods 44, as shown in Fig. 1. These driving devices are oppositely arranged, one being employed to move the frame and the other to shift it to closed position.
The operation of my apparatusis as follows: The apparatus closed in positionthat is, having mirrors 8 and 10 and 9 and 11 alinedis placed upon its support, and the object the distance of which from the observer is to be determined being selected the instrument is so placed that the observer, looking through the spy-glass 13 or sighting upon a sight-mark placed in the same position, shall see the object reflected from mirrorS and shall bring the image of that object into alinement with the sight-mark. Having done this, the position of frame 1 is fixed for the observation. The operator then shifts one of the handles 43,
of the frame.
stapes 3T releasing one of the frame-shifting devices, so as to turn the frame 2 upon its pivotal center. It being understood that mirror 11 travels slightly more rapidly that mirror 10, the frame 2 is revolved until the observer, looking in the mirror 10 over a mark or small telescope on a convenient part of the instru ment, as above the pivot-point 15, where the image of the object and the point 15 can be seen in the mirror 10, will see the image of the object reflected from mirror 11 moving along mirror 10 toward the left until such image of-the object coincides with the reflection in mirror 10 of the indicator on mirror 11, which in the construction shown is the left-hand end of the mirror 11. When this alinement of the image of the object with the end of mirror 11 reflected in 10 has been efiected, the operator releases the handle 44:, thereby checking the movement of the frame. Prior to shifting the frame the slide 29 should be in the position shown in Fig. 7. By the turning movement of the frame 2 the rack 25 is moved in the direction of the arrow at a distance proportional to the outward movement As soon as the movement of the frame is stopped the operator depresses one of the fingers 39, so that the slide 29 will be moved to the left, actuating the indicating-dials until arrested by the rib 28 on arm 28, striking against the spur 27 on the rack 25. As soon as the movement of the slide 29 is arrested the operator can read the distance of the object observed on the dials.
In constructing my improved range-finder I take a triangle, preferably a right-angled triangle, having a base which is a multiple of the medial length of the apparatus or the distance between the pivotal center of the frame and the pivotal center of the mirror 11 and whose apex is at the object-as, for example, if the apparatus has a medial length of two feet the base of the triangle will have a length of seven hundred and twenty feet or any other length of whichtwo is an exact divisor. The mirrors 10 and 11, which might properly be termed focusing-mirrors, are so arranged and shifted in relation to each other that when the images of the object and the indicator on mirror 11 have coincided in mirror 10 a given point on the frame will have moved an angular distance from a given point on the base-plate, said. points coinciding or registering one with the other when the mirror 11 is parallel with mirror 9, such angle having a certain fixed relation to the angle at the object or at the apex of the triangle having the given'baseas, for example, in the construction shown the edges 0. and b of the frame and base-plate coincide or register with each other and when the instrument is closed lie in a plane passing through the center of movement of the frame and may be taken as reference-points, above referred to. When the apparatus has been sighted on the object by mirror-s8 and 9 and focused by shifting the frame, as above described,
the edge a, of the frame will be at an angle to the edge b of the baseplate, and the apparatus is so constructed that the angle a c b will have a certain fixed relation to the angle at the apex of the right-angled triangle. It is preferred to so construct the apparatus that when focused the angle will equal the angle 10, 0 p at the apex 0 of the right-angled triangle, whose base is a multiple of the medial length of the instrument.
By reference to Fig. 10 it will be seen that the angle a c b, formed by lines passing through the reference points or edges (1 b and the axis of movement of the frame, is equal to the angle n 0 p and that the angle a c b is equal to the angle n 0' p.
The frame 2 in'its movement shifts the spur or stop 27 a'distance proportional to its angular movement. The position of the spur 27 determines the movement of the slide 29, which actuates the indicating mechanism of the apparatus. The indicating mechanism is so constructed in accordance with rules known in the art that for every'chango of position of the frame 2 the dial will indicate the corresponding change in the distance of the center 0 of the apparatus to the object.
I claim herein as my invention 1. A range-finder having a medial length which is a factor of the base of a right-angled triangle in combination with a member movable on a center, which forms one terminus of the base of said triangle, a distance-indieating mechanism controlled by the movable member and focusing mechanism for determining the range of movement of the movable member, substantially as set forth.
2. A range-finder having in combination two movable mirrors arranged so that the image of an object will be reflected from one to the other, means for shifting said mirrors one at a greater speed than the other to bring the image of an indicating-mark reflected in one mirror into indicating relation to the image of a distant object reflected in both mirrors, and an indicating mechanism operated in accordance with the movements of the mirrors, substantially as set forth.
3. A range-finder having in combination a base, a frame pivotally mounted on the base, a mirror secured on said frame, a second mirror pivotally mounted on the frame, means for shifting the frame, means shifting the second mirror independent of the frame and an indicating mechanism movable independent of but controlled by the movement of the frame, substantially as set forth.
4. A range-finder having in combination a base, a frame pivotally mounted on the base, a mirror mounted on the frame, a second mirror pivotally mounted on the frame, means for shifting the frame, connections from the frame to the second mirror whereby the latter may be shifted at a greater speed than the frame, and an indicating mechanism operated by the frame, substantially as set forth.
5. A range-finder having in combination a ICC base,aframe pivotally mounted on the base,a ent rates of speed, a slide operated by the mirror carried by the frame, means for shiftframe, a stop carried by the slide, a springing the frame, a second mirror pivotally actuated slide and an indicating mechanism [5 mounted on the frame and movable thereby, operated by the slide, substantially as set 5 a stop device operated by the frame and a forth.
spring-operated indicating mechanism con- In testimony whereof I have hereunto set trolled by the stop, substantially as set forth. my hand.
6. A ran e-finder having in combination a base, a fran ie pivotally mounted on the base, a NICHOLAS TOBIN 10 mirror carried by the frame, a second mirror Witnessesi pivotally mounted on the frame, means for F. E. GAITHER,
moving the frame and second mirror at difier- F A. DANNER,
US3512300A 1900-11-01 1900-11-01 Range-finder. Expired - Lifetime US673099A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US3512300A US673099A (en) 1900-11-01 1900-11-01 Range-finder.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3512300A US673099A (en) 1900-11-01 1900-11-01 Range-finder.

Publications (1)

Publication Number Publication Date
US673099A true US673099A (en) 1901-04-30

Family

ID=2741651

Family Applications (1)

Application Number Title Priority Date Filing Date
US3512300A Expired - Lifetime US673099A (en) 1900-11-01 1900-11-01 Range-finder.

Country Status (1)

Country Link
US (1) US673099A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100068839A1 (en) * 2007-05-31 2010-03-18 Nthdegree Technologies Worldwide Inc. Method of Manufacturing a Light Emitting, Photovoltaic or Other Electronic Apparatus and System

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100068839A1 (en) * 2007-05-31 2010-03-18 Nthdegree Technologies Worldwide Inc. Method of Manufacturing a Light Emitting, Photovoltaic or Other Electronic Apparatus and System

Similar Documents

Publication Publication Date Title
US2157548A (en) Photographic view finder
US673099A (en) Range-finder.
US2655834A (en) Reflecting projector with automatic focus mechanism
US2363964A (en) Extensometer
US2448965A (en) Automatic recording stadia instrument
US3079833A (en) Rangefinder and gunsight combination with coupled reticle adjusting means for ballistc curve changes
US940504A (en) Photographer's range-finder.
US1006825A (en) Ophthalmometer.
US918190A (en) Depression range-finder.
US1754872A (en) Theodolite and other angle measuring instruments
US2311769A (en) Range controlled speed indicator
US770833A (en) Range-finder.
US1278080A (en) Indicator for cameras.
US3238838A (en) Viewing and illuminating device
US739475A (en) Range-finder or telemeter.
US536493A (en) District of
US1813673A (en) Stereoscopic telemeter
US729491A (en) Instrument for indicating and recording the aiming of naval guns.
US213018A (en) Improvement in surveying-instruments
US861331A (en) Horizontal range-finder.
US467895A (en) mayson
US1493095A (en) Fire-control apparatus
US686770A (en) Distance instrument.
US15602A (en) Instrument for measuring distances from a single station
US1529225A (en) Range finder for submarine and other periscopes