GB417740A - Device for measuring the density of photographic negatives and copying the same - Google Patents

Device for measuring the density of photographic negatives and copying the same

Info

Publication number
GB417740A
GB417740A GB32612/33A GB3261233A GB417740A GB 417740 A GB417740 A GB 417740A GB 32612/33 A GB32612/33 A GB 32612/33A GB 3261233 A GB3261233 A GB 3261233A GB 417740 A GB417740 A GB 417740A
Authority
GB
United Kingdom
Prior art keywords
printing
negative
lamp
measuring
density
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
GB32612/33A
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.)
Duerkoppwerke GmbH
Original Assignee
Duerkoppwerke GmbH
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 Duerkoppwerke GmbH filed Critical Duerkoppwerke GmbH
Publication of GB417740A publication Critical patent/GB417740A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/12—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means
    • G01J1/122—Visual exposure meters for determining the exposure time in photographical recording or reproducing
    • G01J1/124—Visual exposure meters for determining the exposure time in photographical recording or reproducing based on the comparison of the intensity of measured light with a comparison source or comparison illuminated surface

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Projection-Type Copiers In General (AREA)

Abstract

417,740. Photographic printing - apparatus. DURKOPP WERKE AKT.- GES., 2, Nikolaus.D³rkoppstrasse, Bielefeld, Germany. Nov. 22, 1933, No. 32612. Convention date, Nov. 22, 1932. [Class 98 (i).] Apparatus for measuring the density of and printing photographic negatives is characterized in that the negative itself serves as one of two comparison fields needed for the measuring of the opacity and exposure time for printing, without bringing the light, passing through a certain limited portion of the negative, through an additional screen. As shown, the apparatus comprises a casing a, a printing lamp b, a glass sheet c on which is fixed the negative d and a movable lamp e with comparison field f placed by hand on the negative. The lamp e has a casing h, i underneath which is a mirror l. A shield m for the mirror l may be provided. One comparison lamp e may be used for several printing apparatus.
GB32612/33A 1932-11-22 1933-11-22 Device for measuring the density of photographic negatives and copying the same Expired GB417740A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE417740X 1932-11-22

Publications (1)

Publication Number Publication Date
GB417740A true GB417740A (en) 1934-10-11

Family

ID=31895495

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32612/33A Expired GB417740A (en) 1932-11-22 1933-11-22 Device for measuring the density of photographic negatives and copying the same

Country Status (1)

Country Link
GB (1) GB417740A (en)

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