GB721270A - Improvements in optical apparatus - Google Patents

Improvements in optical apparatus

Info

Publication number
GB721270A
GB721270A GB76247A GB76247A GB721270A GB 721270 A GB721270 A GB 721270A GB 76247 A GB76247 A GB 76247A GB 76247 A GB76247 A GB 76247A GB 721270 A GB721270 A GB 721270A
Authority
GB
United Kingdom
Prior art keywords
prism
faces
parallel
degree
transmitted
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
Application number
GB76247A
Inventor
Albert Maurel Uttley
Leonard Manns
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.)
Minister of Supply In Her Majesty S Government
Original Assignee
Minister of Supply In Her Majesty S Government
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 Minister of Supply In Her Majesty S Government filed Critical Minister of Supply In Her Majesty S Government
Priority to GB76247A priority Critical patent/GB721270A/en
Publication of GB721270A publication Critical patent/GB721270A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/02—Catoptric systems, e.g. image erecting and reversing system
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms

Abstract

721,270. Optical prisms. MINISTER OF SUPPLY. March 5, 1948 [Jan. 9, 1947], No. 762/47. Class 97 (1). To afford an indirect view of the whole or a large part of the sky, a light-directing device comprises an erecting prism having formed as an externally reflecting mirror, at least one of its faces 1, 2 parallel to the median plane (i.e. the plane containing all incident rays which enter one 45 degree face and are transmitted in the same plane from the opposite 45 degree face). The prism may be formed as a truncated regular pyramid having an even number of sides, Fig. 6. The device is mounted for rotation about an axis in the median plane, parallel to one of the 45 degree faces and displaced from the centre of the prism by an amount varying for different values of Á and proportional to the distance between the parallel faces 1, 2. In astronomical apparatus an incident light beam is transmitted by the prism to a fixed telescope having a longitudinal axis intersecting the axis of rotation at its mid-point.
GB76247A 1947-01-09 1947-01-09 Improvements in optical apparatus Expired GB721270A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB76247A GB721270A (en) 1947-01-09 1947-01-09 Improvements in optical apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB76247A GB721270A (en) 1947-01-09 1947-01-09 Improvements in optical apparatus

Publications (1)

Publication Number Publication Date
GB721270A true GB721270A (en) 1955-01-05

Family

ID=9710070

Family Applications (1)

Application Number Title Priority Date Filing Date
GB76247A Expired GB721270A (en) 1947-01-09 1947-01-09 Improvements in optical apparatus

Country Status (1)

Country Link
GB (1) GB721270A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499723A1 (en) * 1981-02-12 1982-08-13 Nippon Sheet Glass Co Ltd OPTICAL DISTRIBUTOR

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499723A1 (en) * 1981-02-12 1982-08-13 Nippon Sheet Glass Co Ltd OPTICAL DISTRIBUTOR

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