GB473539A - Improvements in and relating to viewing devices especially for aircraft - Google Patents
Improvements in and relating to viewing devices especially for aircraftInfo
- Publication number
- GB473539A GB473539A GB645736A GB645736A GB473539A GB 473539 A GB473539 A GB 473539A GB 645736 A GB645736 A GB 645736A GB 645736 A GB645736 A GB 645736A GB 473539 A GB473539 A GB 473539A
- Authority
- GB
- United Kingdom
- Prior art keywords
- objective
- reflector
- lens
- telescopes
- reflectors
- 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
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
- G02B23/08—Periscopes
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Telescopes (AREA)
Abstract
473,539. Telescopes for use on aircraft &c. HOUGHTON-BUTCHER MANUFACTURING CO., Ltd., DRABBLE, J. E. L., and POOLE, V. J. A. April 16, 1936, No. 6457. [Class 97 (i)] A viewing device for use on aircraft to enable the pilot to observe the ground comprises a positive objective A of short focus and wide angle, a collecting lens C in or near the image plane of the objective A, an intermediate objective D, a second collecting lens E in or near the plane of the erected image formed by the objective D and an eyepiece lens F of such low magnification that the final image can be seen without any exact positioning of the eyes being required. The instrument also includes an even number of reflectors, each of which changes the direction of the optical axis. In the form shown in Fig. 2, three reflectors M2, M3, M4 are positioned within the instrument and a fourth reflector M1 is disposed externally to direct rays from the ground to the objective A, this reflector being pivoted at P to enable the ground to be traversed. A graticule may be provided in the plane of the image formed either by the lens A or by the lens D. The form shown in Fig. 7 comprises two reflectors M3, M4, the mounting for the optical elements comprising a fixed part H1 and a part H2 which can be rotated about a line in the surface of the reflector M4. This reflector is itself rotated about the same axis at half the speed of rotation of the tube H2. The form shown in Fig. 9 comprises two telescopes Ha, Hb for alternative use, one giving a large field with low magnification and the other a small field with high magnification. A single objective is mounted on a shaft 16 so that it can be moved into position for use with either of the telescopes, the other end of the shaft carrying a shutter 17 having an aperture which uncovers the appropriate eyepiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB645736A GB473539A (en) | 1936-04-16 | 1936-04-16 | Improvements in and relating to viewing devices especially for aircraft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB645736A GB473539A (en) | 1936-04-16 | 1936-04-16 | Improvements in and relating to viewing devices especially for aircraft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB473539A true GB473539A (en) | 1937-10-15 |
Family
ID=9814805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB645736A Expired GB473539A (en) | 1936-04-16 | 1936-04-16 | Improvements in and relating to viewing devices especially for aircraft |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB473539A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2453257A (en) * | 1945-03-05 | 1948-11-09 | Harvey N Ott | Rotatable microscope eyepiece mounting and guard means therefor |
| US3027797A (en) * | 1961-02-23 | 1962-04-03 | Gen Precision Inc | Space navigation sextant |
| EP0455843A1 (en) * | 1988-10-14 | 1991-11-13 | Jan-Chou Ou | Rear view lens apparatus for automotive vehicle |
| US5687023A (en) * | 1993-02-19 | 1997-11-11 | Nikon Corporation | Keplerian zoom finder optical system |
| CN111519942A (en) * | 2020-04-27 | 2020-08-11 | 胡贵华 | Novel bus waiting station booth |
| CN112946872A (en) * | 2021-02-19 | 2021-06-11 | 戚聿斌 | Universal observation mirror capable of being automatically cleaned and use method thereof |
-
1936
- 1936-04-16 GB GB645736A patent/GB473539A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2453257A (en) * | 1945-03-05 | 1948-11-09 | Harvey N Ott | Rotatable microscope eyepiece mounting and guard means therefor |
| US3027797A (en) * | 1961-02-23 | 1962-04-03 | Gen Precision Inc | Space navigation sextant |
| EP0455843A1 (en) * | 1988-10-14 | 1991-11-13 | Jan-Chou Ou | Rear view lens apparatus for automotive vehicle |
| US5687023A (en) * | 1993-02-19 | 1997-11-11 | Nikon Corporation | Keplerian zoom finder optical system |
| CN111519942A (en) * | 2020-04-27 | 2020-08-11 | 胡贵华 | Novel bus waiting station booth |
| CN112946872A (en) * | 2021-02-19 | 2021-06-11 | 戚聿斌 | Universal observation mirror capable of being automatically cleaned and use method thereof |
| CN112946872B (en) * | 2021-02-19 | 2022-09-13 | 北京龙翼风科技有限公司 | Universal observation mirror capable of being automatically cleaned and use method thereof |
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