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
GB4219/49A
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
Allmanna Svenska Elektriska AB
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 ASEA AB, Allmanna Svenska Elektriska ABfiledCriticalASEA AB
Publication of GB657451ApublicationCriticalpatent/GB657451A/en
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
H05B39/04—Controlling
Landscapes
Circuit Arrangement For Electric Light Sources In General
(AREA)
Abstract
657,451. Theatre lighting systems. ALLMANNA SVENSKA ELEKTRISKA AKTIEBOLAGET. Feb. 16, 1949, No. 4219. Convention date, March 13, 1948. [Class 132 (i)] A theatre lighting system in which the electric currents for the various lighting units are controlled from a central room by transductors, one in each lighting circuit, is characterized in that an image of the lighting system is arranged at the control room, said image having sources of light which are fed by current transformers or shunt resistances in the circuit of the corresponding sources of the lighting system. The lamps in the image are prevented from becoming overloaded either by the cores of the current transformers becoming saturated or by other means when shunt resistances are used.
GB4219/49A1948-03-131949-02-16Improvements in theatre lighting systems
ExpiredGB657451A
(en)