GB361650A - Improvements in optical observation instruments - Google Patents
Improvements in optical observation instrumentsInfo
- Publication number
- GB361650A GB361650A GB3723030A GB3723030A GB361650A GB 361650 A GB361650 A GB 361650A GB 3723030 A GB3723030 A GB 3723030A GB 3723030 A GB3723030 A GB 3723030A GB 361650 A GB361650 A GB 361650A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prism
- field lens
- roof
- eyepiece
- cemented
- 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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Telescopes (AREA)
- Lenses (AREA)
Abstract
361,650. Optical instruments. BARR & STROUD, Ltd. and FRENCH, J. W., Caxton Street, Anniesland, Glasgow. Dec. 10, 1930, No. 37230. [Class 97 (i).] In an optical observation-instrument of the type in which the axis of the eyepiece is inclined to the line of sight and both are in the same plane, and erection of the image results from a single reflection in the plane of sight and crosswise reflection from the two surfaces of an oblique roof prism, the roof prism is extended at one end and directly associated with an objective and is extended at the other end to form a focal plane surface, or for the attachment of a field lens. In the form shown a compound objective 2 is cemented to the surface 4 of the roof prism and the face 8 of the prism is worked to the required curvature of the field lens when such lens is employed or it may be made flat or concave. Where reference marks are required in the focal plane a separate field lens may be cemented to a flat surface of the prism and the reference marks formed on whichever surface is more convenient. The distance from the eyepiece to the part 9 of the line of intersection of the roof surfaces is made sufficiently large to prevent this part being seen as an objectionable shadow in the field of view.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3723030A GB361650A (en) | 1930-12-10 | 1930-12-10 | Improvements in optical observation instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3723030A GB361650A (en) | 1930-12-10 | 1930-12-10 | Improvements in optical observation instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB361650A true GB361650A (en) | 1931-11-26 |
Family
ID=10394815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3723030A Expired GB361650A (en) | 1930-12-10 | 1930-12-10 | Improvements in optical observation instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB361650A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009032547A1 (en) * | 2007-09-06 | 2009-03-12 | The Boeing Company | Illuminated optical inspection prism apparatus |
-
1930
- 1930-12-10 GB GB3723030A patent/GB361650A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009032547A1 (en) * | 2007-09-06 | 2009-03-12 | The Boeing Company | Illuminated optical inspection prism apparatus |
| US7843641B2 (en) | 2007-09-06 | 2010-11-30 | The Boeing Company | Illuminated optical inspection prism apparatus |
| CN101855540B (en) * | 2007-09-06 | 2012-10-24 | 波音公司 | Illuminated optical inspection prism apparatus |
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