GB946496A - Lamp switching circuit - Google Patents

Lamp switching circuit

Info

Publication number
GB946496A
GB946496A GB3785461A GB3785461A GB946496A GB 946496 A GB946496 A GB 946496A GB 3785461 A GB3785461 A GB 3785461A GB 3785461 A GB3785461 A GB 3785461A GB 946496 A GB946496 A GB 946496A
Authority
GB
United Kingdom
Prior art keywords
switching circuit
lamp switching
lamps
oct
standby lighting
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
GB3785461A
Inventor
Harold William Cliff Pilling
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.)
Chamberlain and Hookham Ltd
Original Assignee
Chamberlain and Hookham 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 Chamberlain and Hookham Ltd filed Critical Chamberlain and Hookham Ltd
Priority to GB3785461A priority Critical patent/GB946496A/en
Publication of GB946496A publication Critical patent/GB946496A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/10—Circuits providing for substitution of the light source in case of its failure
    • H05B39/105—Circuits providing for substitution of the light source in case of its failure with a spare lamp in the circuit, and a possibility of shunting a failed lamp

Abstract

946,496. Standby lighting systems. CHAMBERLAIN & HOOKHAM Ltd. Oct. 10, 1962 [Oct. 23, 1961], No. 37854/61. Heading H2H. A standby lighting system comprises two lamps L1, L2 connected in a bridge circuit including a resistor R and two sources x, y of current, the source x having a potential difference greater than that of y, for example five times as great. Thus should a lamp fail the other will become illuminated. As described the lamps are used for energizing a photosensitive device.
GB3785461A 1961-10-23 1961-10-23 Lamp switching circuit Expired GB946496A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3785461A GB946496A (en) 1961-10-23 1961-10-23 Lamp switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3785461A GB946496A (en) 1961-10-23 1961-10-23 Lamp switching circuit

Publications (1)

Publication Number Publication Date
GB946496A true GB946496A (en) 1964-01-15

Family

ID=10399488

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3785461A Expired GB946496A (en) 1961-10-23 1961-10-23 Lamp switching circuit

Country Status (1)

Country Link
GB (1) GB946496A (en)

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