GB634831A - Improvements in or relating to photographic exposure meters - Google Patents

Improvements in or relating to photographic exposure meters

Info

Publication number
GB634831A
GB634831A GB3335047A GB3335047A GB634831A GB 634831 A GB634831 A GB 634831A GB 3335047 A GB3335047 A GB 3335047A GB 3335047 A GB3335047 A GB 3335047A GB 634831 A GB634831 A GB 634831A
Authority
GB
United Kingdom
Prior art keywords
photo
relating
wedge
exposure meters
photographic exposure
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
GB3335047A
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.)
Ilford Imaging UK Ltd
Original Assignee
Ilford Ltd
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 Ilford Ltd filed Critical Ilford Ltd
Priority to GB3335047A priority Critical patent/GB634831A/en
Publication of GB634831A publication Critical patent/GB634831A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/087—Making tubes with welded or soldered seams using rods or strips of soldering material
    • 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
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
    • G01J1/4214—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for view-taking apparatus

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optical Measuring Cells (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

634,831. Photo-electric exposure meters. HARRISON, G. B., and ILFORD, Ltd. Dec. 17, 1947, No. 33350. [Class 98 (i)] [Also in Group XL (b)] An exposure meter is in the general form of a wrist-watch, the barrier layer cell being covered with transparent material bearing the graduations for the micro-ammeter and receiving light through the glass. The calculating scales may be carried by knurled rims for direct operation or may be rotated by knobs'through gearing. In a modification, a continuouslyvariable density wedge is adjustable over the photo-cell to bring the microammeter to a standard reading, the position of the wedge then indicating the light value.
GB3335047A 1947-12-17 1947-12-17 Improvements in or relating to photographic exposure meters Expired GB634831A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3335047A GB634831A (en) 1947-12-17 1947-12-17 Improvements in or relating to photographic exposure meters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3335047A GB634831A (en) 1947-12-17 1947-12-17 Improvements in or relating to photographic exposure meters

Publications (1)

Publication Number Publication Date
GB634831A true GB634831A (en) 1950-03-29

Family

ID=10351805

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3335047A Expired GB634831A (en) 1947-12-17 1947-12-17 Improvements in or relating to photographic exposure meters

Country Status (1)

Country Link
GB (1) GB634831A (en)

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