GB435473A - Improvements in photographically recording sound - Google Patents

Improvements in photographically recording sound

Info

Publication number
GB435473A
GB435473A GB9171/34A GB917134A GB435473A GB 435473 A GB435473 A GB 435473A GB 9171/34 A GB9171/34 A GB 9171/34A GB 917134 A GB917134 A GB 917134A GB 435473 A GB435473 A GB 435473A
Authority
GB
United Kingdom
Prior art keywords
print
negative
positive
metol
march
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
GB9171/34A
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Publication of GB435473A publication Critical patent/GB435473A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/12—Cinematrographic processes of taking pictures or printing
    • G03C5/14—Cinematrographic processes of taking pictures or printing combined with sound-recording

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

435,473. Developing sound-films. I. G. FARBENINDUSTRIE AKT.-GES., Frankforton-Main, Germany. March 23, 1934, No. 9171. Convention date, March 25, 1933. Drawings to Specification. [Class 98 (ii)] [See also Group XXXVIII] Relates to the photographic recording of sound by the variable density method, and to the preparation of a positive print from an original negative in such a manner that the product of the gammas of the positive and of the negative may be unity. According to the invention, the negative film is developed to a gradation of # greater than 1, the exposure having been such that the blackenings corresponding to the maximum and minimum lie on the straight part of the characteristic curve ; a print is then made on an undyed film, the exposure being such that the blackening lies on the straight part of the curve, and the development of the positive is such that its y is the reciprocal of that of the negative. In this way, instead of producing from an original having a flat gradation a relatively dense print, as hitherto, a print having a high average transmission is obtained. Graphs are given in the Specification, to explain the principle of the invention, and a specific example of the procedure to be followed is described, with details including formulae of metol and metol-hydroquinone developers.
GB9171/34A 1933-03-25 1934-03-23 Improvements in photographically recording sound Expired GB435473A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE435473X 1933-03-25

Publications (1)

Publication Number Publication Date
GB435473A true GB435473A (en) 1935-09-23

Family

ID=6506773

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9171/34A Expired GB435473A (en) 1933-03-25 1934-03-23 Improvements in photographically recording sound

Country Status (1)

Country Link
GB (1) GB435473A (en)

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