GB449179A - Improvements relating to object holders for epidiascopes and other like optical projecting apparatus - Google Patents

Improvements relating to object holders for epidiascopes and other like optical projecting apparatus

Info

Publication number
GB449179A
GB449179A GB3666934A GB3666934A GB449179A GB 449179 A GB449179 A GB 449179A GB 3666934 A GB3666934 A GB 3666934A GB 3666934 A GB3666934 A GB 3666934A GB 449179 A GB449179 A GB 449179A
Authority
GB
United Kingdom
Prior art keywords
sheet
epidiascopes
edges
projecting apparatus
improvements 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
GB3666934A
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 GB3666934A priority Critical patent/GB449179A/en
Publication of GB449179A publication Critical patent/GB449179A/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
    • G03B21/54—Accessories
    • G03B21/64—Means for mounting individual pictures to be projected, e.g. frame for transparency

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Glass Melting And Manufacturing (AREA)

Abstract

449,179. Optical-projection apparatus. ALDIS, A. C. W., Sare Hole :Road, Sparkhill, Birmingham. Dec. 21, 1934, No. 36669. [Classes 97 (i) and 98 (ii)] An object holder for use in epidiascopes &c. comprises a rectangular transparent sheet b and a rectangular metal sheet a, the sheet a being turned over the sheet b at opposite edges c, and, if desired, at one of its other edges ; a postcard or other thin flat object may be inserted between the sheets, and so as to be in contact with both, through the open edge or edges. The sheet a may be glass, and the sheet b may have a hole e to expose descriptive matter on the back of the postcard &c. According to the Provisional Specification, both sheets may be of glass, and they may be secured together in other ways.
GB3666934A 1934-12-21 1934-12-21 Improvements relating to object holders for epidiascopes and other like optical projecting apparatus Expired GB449179A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3666934A GB449179A (en) 1934-12-21 1934-12-21 Improvements relating to object holders for epidiascopes and other like optical projecting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3666934A GB449179A (en) 1934-12-21 1934-12-21 Improvements relating to object holders for epidiascopes and other like optical projecting apparatus

Publications (1)

Publication Number Publication Date
GB449179A true GB449179A (en) 1936-06-22

Family

ID=10390202

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3666934A Expired GB449179A (en) 1934-12-21 1934-12-21 Improvements relating to object holders for epidiascopes and other like optical projecting apparatus

Country Status (1)

Country Link
GB (1) GB449179A (en)

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