GB316082A - Improvements in and relating to photographic enlarging and reducing apparatus - Google Patents

Improvements in and relating to photographic enlarging and reducing apparatus

Info

Publication number
GB316082A
GB316082A GB3670828A GB3670828A GB316082A GB 316082 A GB316082 A GB 316082A GB 3670828 A GB3670828 A GB 3670828A GB 3670828 A GB3670828 A GB 3670828A GB 316082 A GB316082 A GB 316082A
Authority
GB
United Kingdom
Prior art keywords
relating
reducing apparatus
williamson
cam surface
photographic enlarging
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
GB3670828A
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
Priority to GB3670828A priority Critical patent/GB316082A/en
Publication of GB316082A publication Critical patent/GB316082A/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
    • G03B27/34—Means for automatic focusing therefor
    • G03B27/36—Means for automatic focusing therefor by mechanical connections, e.g. by cam, by linkage

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Projection-Type Copiers In General (AREA)

Abstract

316,082. Williamson, C. M., and Williamson, S. Dec. 12, 1928. projection printing app a r a t u s . - Continuous focusing adjustment is provided in a vertical form of apparatus by a cam follower 13 moving over a cam surface 8 on the lens carriage 3 and a straight slanting edge on the paper support 2. The follower slides on a transverse rod 12 which has a roller moving on the straight back of cam surface 8. The machine is operated by hand or by the arrangement described in Specification 278,149.
GB3670828A 1928-12-12 1928-12-12 Improvements in and relating to photographic enlarging and reducing apparatus Expired GB316082A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3670828A GB316082A (en) 1928-12-12 1928-12-12 Improvements in and relating to photographic enlarging and reducing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3670828A GB316082A (en) 1928-12-12 1928-12-12 Improvements in and relating to photographic enlarging and reducing apparatus

Publications (1)

Publication Number Publication Date
GB316082A true GB316082A (en) 1929-07-25

Family

ID=10390534

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3670828A Expired GB316082A (en) 1928-12-12 1928-12-12 Improvements in and relating to photographic enlarging and reducing apparatus

Country Status (1)

Country Link
GB (1) GB316082A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5450175A (en) * 1993-07-27 1995-09-12 Konica Corporation Image forming apparatus having optical means for image magnification change

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5450175A (en) * 1993-07-27 1995-09-12 Konica Corporation Image forming apparatus having optical means for image magnification change

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