GB603253A - Improvements in or relating to photographic projection printing apparatus - Google Patents

Improvements in or relating to photographic projection printing apparatus

Info

Publication number
GB603253A
GB603253A GB23674/45A GB2367445A GB603253A GB 603253 A GB603253 A GB 603253A GB 23674/45 A GB23674/45 A GB 23674/45A GB 2367445 A GB2367445 A GB 2367445A GB 603253 A GB603253 A GB 603253A
Authority
GB
United Kingdom
Prior art keywords
support
printing apparatus
colour
filter
relating
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
GB23674/45A
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 GB603253A publication Critical patent/GB603253A/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
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/58—Baseboards, masking frames, or other holders for the sensitive material
    • G03B27/582—Baseboards, easels

Abstract

603,253. Photographic projection-printing apparatus. DRUCKER, S. Sept. 13, 1945, No. 23674. Convention date, Sept. 18, 1941. Drawings to Specification. [Class 98 (i)] A projection printer which has a displaceable light filter of a non-actinic colour is characterised by the use of an opaque support for the light-sensitive material, which support is of the same non-actinic colour as the filter. The opaque support may be constituted by the baseboard of the printer, or by an enlarging easel. The filter may be red, and focusing may be effected with the red light, which provides a visible image on the support of the same colour. During exposure, reflex fogging which might occur if a white baseboard was used, is prevented.
GB23674/45A 1941-09-18 1945-09-13 Improvements in or relating to photographic projection printing apparatus Expired GB603253A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US603253XA 1941-09-18 1941-09-18

Publications (1)

Publication Number Publication Date
GB603253A true GB603253A (en) 1948-06-11

Family

ID=22028786

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23674/45A Expired GB603253A (en) 1941-09-18 1945-09-13 Improvements in or relating to photographic projection printing apparatus

Country Status (1)

Country Link
GB (1) GB603253A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5045878A (en) * 1989-07-28 1991-09-03 Bernd Taeger Cropping device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5045878A (en) * 1989-07-28 1991-09-03 Bernd Taeger Cropping device

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