GB120755A - Improvements in Prismatic Telemeters. - Google Patents
Improvements in Prismatic Telemeters.Info
- Publication number
- GB120755A GB120755A GB1650017A GB1650017A GB120755A GB 120755 A GB120755 A GB 120755A GB 1650017 A GB1650017 A GB 1650017A GB 1650017 A GB1650017 A GB 1650017A GB 120755 A GB120755 A GB 120755A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prism
- ring
- distance
- handle
- prisms
- 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
- G01C3/32—Measuring distances in line of sight; Optical rangefinders by focusing the object, e.g. on a ground glass screen
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Telescopes (AREA)
Abstract
120,755. Ray, J .W. Nov. 10, 1917. Range - finders. - Apparatus for use in determining distances, or for enabling a constant distance to be maintained between ships, comprises a prism rotatably mounted in a ring, the ring being provided with a handle by which it may be held at arm's length with its plane vertical and also with a definite diameter vertical; in a modification, two similar prisms rotatable simultaneously and equally in opposite directions may be provided. As shown in Fig. 3, a prism D is carried by a bezel B which is provided with a handle and is rotatable in a ring A. The ring A is split at its lowest point, the ends being secured to a piece a<3> which has a screwed stem a<4> fitting into a handle C. A clamping-screw which passes through the piece a<3> and the ring A enables the bezel to be secured in any desired position. In use the instrument is held so that an object may be viewed directly and also through the prism, and the prism is adjusted so that a particular point on the object, as seen directly, is level with another particular point on the object, as seen through the prism, the prism being then clamped in position. Any change in the relative distance of the object will be indicated in later observations by variation in the relative levels of the points observed. If the distance between the points is known the distance of the object may be obtained by observing the angle through which the prism has been rotated and by use of a reference table. In the modification shown in Fig. 6, two prisms D, D' (shown in broken lines) are mounted in separate bevels B, B<1>, each having a ring of teeth b<5> engaged by a pinion b<6> attached to a milled wheel b'. As the milled wheel is turned, the prisms are rotated in opposite directions, the image being consequently displaced vertically without lateral displacement.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1650017A GB120755A (en) | 1917-11-10 | 1917-11-10 | Improvements in Prismatic Telemeters. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1650017A GB120755A (en) | 1917-11-10 | 1917-11-10 | Improvements in Prismatic Telemeters. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB120755A true GB120755A (en) | 1918-11-11 |
Family
ID=32347195
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1650017A Expired GB120755A (en) | 1917-11-10 | 1917-11-10 | Improvements in Prismatic Telemeters. |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB120755A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3137755A (en) * | 1960-06-01 | 1964-06-16 | Thomas R Smith | Bow sight |
-
1917
- 1917-11-10 GB GB1650017A patent/GB120755A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3137755A (en) * | 1960-06-01 | 1964-06-16 | Thomas R Smith | Bow sight |
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