GB324518A - Improvements in optical measuring instruments such as inclinometers, rangefinders, heightfinders, and the like - Google Patents
Improvements in optical measuring instruments such as inclinometers, rangefinders, heightfinders, and the likeInfo
- Publication number
- GB324518A GB324518A GB228629A GB228629A GB324518A GB 324518 A GB324518 A GB 324518A GB 228629 A GB228629 A GB 228629A GB 228629 A GB228629 A GB 228629A GB 324518 A GB324518 A GB 324518A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prisms
- rack
- movement
- barr
- cams
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
- G01C3/10—Measuring 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
- G01C3/12—Measuring 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
Abstract
324,518. Barr &. Stroud, Ltd., Barr, A., and Strang, J. M. Jan. 23, 1929. Range-finders-In optical measuring instruments in which the measurement is made by the translation of a refracting prism or prisms of small angle to and fro along the path of one, or both, of the convergent beams of light, means are provided whereby the movement of the image caused by the translational movement is modified by an additional movement of an optical part, thereby modifying the scale of measurement. In one example, as shown in Fig. 2, two prisms A1 and A2 in a carrier 4 are moved in one of the two convergent beams. The rack 3 and pinion 2 give a translational motion to the prisms and the pins 5 and 6 working in slots 5<1> and 6<1> give a rotary movement. The prisms also may be situated one in each beam. In the first example the cams are not exactly similar as with prisms of finite thickness half of the image would then be displaced vertically with respect to the other half, but in the second case the two halves move together when the cams are similar. Fig. 4 shows an example using a glass plate A3 as the displacing device. The plate rotates around the axis 7 and a spring 8 holds it in contact with cam 9 placed on the shaft carrying the pinion. Fig. 5 illustrates the use of two rotating prisms A<4> and A<5> connected together by gearing and driven by a pin 11 working in the extension 10 of the rack 3. Also an objective D can be moved as in Fig. 6 by a lever 13 actuated by a cam 12 on the end of the rack 3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB228629A GB324518A (en) | 1929-01-23 | 1929-01-23 | Improvements in optical measuring instruments such as inclinometers, rangefinders, heightfinders, and the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB228629A GB324518A (en) | 1929-01-23 | 1929-01-23 | Improvements in optical measuring instruments such as inclinometers, rangefinders, heightfinders, and the like |
Publications (1)
Publication Number | Publication Date |
---|---|
GB324518A true GB324518A (en) | 1930-01-30 |
Family
ID=9736880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB228629A Expired GB324518A (en) | 1929-01-23 | 1929-01-23 | Improvements in optical measuring instruments such as inclinometers, rangefinders, heightfinders, and the like |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB324518A (en) |
-
1929
- 1929-01-23 GB GB228629A patent/GB324518A/en not_active Expired
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