GB420254A - Improvements in or relating to electric light fittings - Google Patents

Improvements in or relating to electric light fittings

Info

Publication number
GB420254A
GB420254A GB2895433A GB2895433A GB420254A GB 420254 A GB420254 A GB 420254A GB 2895433 A GB2895433 A GB 2895433A GB 2895433 A GB2895433 A GB 2895433A GB 420254 A GB420254 A GB 420254A
Authority
GB
United Kingdom
Prior art keywords
electric
relating
electric light
light fittings
bands
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
GB2895433A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB2895433A priority Critical patent/GB420254A/en
Publication of GB420254A publication Critical patent/GB420254A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

420,254. Testing polished surfaces. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, and WALDRAM, J. M., c /o General Electric Co., Wembley, Middlesex. Oct. 19, 1933, No. 28954. [Class 97 (i)] An electric light fitting for illuminating a polished surface to be examined for imperfections, comprises a surface, consisting of alternate light and dark bands, arranged to be substantially evenly illuminated by one or more electric lamps. The bands can be produced by painting strips on an opal diffusing surface, but are preferably obtained by supporting a grid in front of the opal glass in such a way that it can readily be removed and replaced by another.
GB2895433A 1933-10-19 1933-10-19 Improvements in or relating to electric light fittings Expired GB420254A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2895433A GB420254A (en) 1933-10-19 1933-10-19 Improvements in or relating to electric light fittings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2895433A GB420254A (en) 1933-10-19 1933-10-19 Improvements in or relating to electric light fittings

Publications (1)

Publication Number Publication Date
GB420254A true GB420254A (en) 1934-11-28

Family

ID=10283883

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2895433A Expired GB420254A (en) 1933-10-19 1933-10-19 Improvements in or relating to electric light fittings

Country Status (1)

Country Link
GB (1) GB420254A (en)

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