GB638493A - Improvements in apparatus for observing objects on an enlarged scale - Google Patents

Improvements in apparatus for observing objects on an enlarged scale

Info

Publication number
GB638493A
GB638493A GB19983/46A GB1998346A GB638493A GB 638493 A GB638493 A GB 638493A GB 19983/46 A GB19983/46 A GB 19983/46A GB 1998346 A GB1998346 A GB 1998346A GB 638493 A GB638493 A GB 638493A
Authority
GB
United Kingdom
Prior art keywords
screen
micro
film
lamp house
enlarged scale
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
GB19983/46A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB638493A publication Critical patent/GB638493A/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
    • G03B21/10—Projectors with built-in or built-on screen
    • G03B21/11—Projectors with built-in or built-on screen for microfilm reading

Abstract

638,493. Optical-projection apparatus. CORDONNIER, G. July 4, 1946, No. 19983. Convention date, July 7, 1942. [Class 97 (i)] An apparatus for examining micro-films comprises a lamp house 1 on the platform 1a of which the micro-film is supported. An objective 2 forms a real image of the micro-film on a screen 3, from which depends a hood 4, and, between the platform 1a and the screen, a mirror 5 is positioned, out of but closely adjacent to the light path between lens 2 and the screen, so that a vertual image 6 of the micro-film can be viewed by an observer 8. The screen 3 is supported by a skeleton framework mounted on the lamp house 1 or on a table 7 and the mirror 5 is adjustably mounted on the lamp house by means not shown. Specification 237,894, [Class 97 (i)], is referred to.
GB19983/46A 1942-07-07 1946-07-04 Improvements in apparatus for observing objects on an enlarged scale Expired GB638493A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR638493X 1942-07-07

Publications (1)

Publication Number Publication Date
GB638493A true GB638493A (en) 1950-06-07

Family

ID=8996020

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19983/46A Expired GB638493A (en) 1942-07-07 1946-07-04 Improvements in apparatus for observing objects on an enlarged scale

Country Status (1)

Country Link
GB (1) GB638493A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1011166B (en) * 1953-04-06 1957-06-27 Jess Oppenheimer Device for the optical transmission of information to lecturers
GB2355080A (en) * 1999-10-06 2001-04-11 Gareth Lloyd Slide projector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1011166B (en) * 1953-04-06 1957-06-27 Jess Oppenheimer Device for the optical transmission of information to lecturers
GB2355080A (en) * 1999-10-06 2001-04-11 Gareth Lloyd Slide projector
GB2355080B (en) * 1999-10-06 2003-06-25 Gareth Lloyd A slide projector
US6769778B1 (en) 1999-10-06 2004-08-03 Gareth Lloyd Slide projector

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