GB1384539A - Backprojection episcope - Google Patents

Backprojection episcope

Info

Publication number
GB1384539A
GB1384539A GB1851371A GB1851371A GB1384539A GB 1384539 A GB1384539 A GB 1384539A GB 1851371 A GB1851371 A GB 1851371A GB 1851371 A GB1851371 A GB 1851371A GB 1384539 A GB1384539 A GB 1384539A
Authority
GB
United Kingdom
Prior art keywords
projected
episcope
backprojection
june
gate
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
GB1851371A
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.)
Kerwood R C
Original Assignee
Kerwood R C
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 Kerwood R C filed Critical Kerwood R C
Priority to GB1851371A priority Critical patent/GB1384539A/en
Publication of GB1384539A publication Critical patent/GB1384539A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/06—Projectors or projection-type viewers; Accessories therefor affording only episcopic projection

Abstract

1384539 Episcopic projector R C KERWOOD 2 June 1972 [2 June 1971] 18513/71 Heading G2J An episcopic projector for use as a teaching aid comprises a lamp 2, fan 8, adjustable lens system 13, mirrors 14, 15 and a ground glass screen 5. A sheet to be projected may be placed in a gate 9 or an object to be projected may be placed on a tray 41. The size of gate 9 is adjustable by means of a shutter 92, e.g. to conceal an answer to a question on a sheet being projected.
GB1851371A 1971-06-02 1971-06-02 Backprojection episcope Expired GB1384539A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1851371A GB1384539A (en) 1971-06-02 1971-06-02 Backprojection episcope

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1851371A GB1384539A (en) 1971-06-02 1971-06-02 Backprojection episcope

Publications (1)

Publication Number Publication Date
GB1384539A true GB1384539A (en) 1975-02-19

Family

ID=10113723

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1851371A Expired GB1384539A (en) 1971-06-02 1971-06-02 Backprojection episcope

Country Status (1)

Country Link
GB (1) GB1384539A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980000622A1 (en) * 1978-09-13 1980-04-03 Reflecta Gmbh Foto Device for presenting opaque images,for example photos

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980000622A1 (en) * 1978-09-13 1980-04-03 Reflecta Gmbh Foto Device for presenting opaque images,for example photos

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee