GB495641A - Improvements in lamp enclosures - Google Patents

Improvements in lamp enclosures

Info

Publication number
GB495641A
GB495641A GB11902/37A GB1190237A GB495641A GB 495641 A GB495641 A GB 495641A GB 11902/37 A GB11902/37 A GB 11902/37A GB 1190237 A GB1190237 A GB 1190237A GB 495641 A GB495641 A GB 495641A
Authority
GB
United Kingdom
Prior art keywords
enclosure
illuminant
foci
april
focus
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
GB11902/37A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB495641A publication Critical patent/GB495641A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2121/00—Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00
    • F21W2121/02—Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00 for fountains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/401—Lighting for industrial, commercial, recreational or military use for swimming pools

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

495,641. Illuminant enclosures ; incandescent electric lamps. BRITISH THOMSON-HOUSTON CO., Ltd. April 26, 1937, No. 11902. Convention date, April 25, 1936. [Classes 39 (ii) and 75 (ii)] An illuminant enclosure for use in a liquid comprises an ellipsoidal reflecting portion A with foci F, F<11> and a coaxial hyperboloidal transmitting portion B with foci F, F<1>, the eccentricity of the hyperboloid being equal to the refractive index of the liquid divided by that of air. The light source is placed at the focus F", preferably along the axis of the enclosure, and the emergent beam is parallel to said axis. The enclosure may be the bulb of an incandescent electric lamp with its filament at the focus F<11>.
GB11902/37A 1936-04-25 1937-04-26 Improvements in lamp enclosures Expired GB495641A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR495641X 1936-04-25

Publications (1)

Publication Number Publication Date
GB495641A true GB495641A (en) 1938-11-17

Family

ID=8904810

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11902/37A Expired GB495641A (en) 1936-04-25 1937-04-26 Improvements in lamp enclosures

Country Status (1)

Country Link
GB (1) GB495641A (en)

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