GB217574A - Improvements in illuminating devices for cinematographic projection apparatus - Google Patents
Improvements in illuminating devices for cinematographic projection apparatusInfo
- Publication number
- GB217574A GB217574A GB13371/24A GB1337124A GB217574A GB 217574 A GB217574 A GB 217574A GB 13371/24 A GB13371/24 A GB 13371/24A GB 1337124 A GB1337124 A GB 1337124A GB 217574 A GB217574 A GB 217574A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filaments
- projection apparatus
- illuminating devices
- circuit
- cinematographic projection
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K9/00—Lamps having two or more incandescent bodies separately heated
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K7/00—Lamps for purposes other than general lighting
- H01K7/02—Lamps for purposes other than general lighting for producing a narrow beam of light; for approximating a point-like source of light, e.g. for searchlight, for cinematographic projector
Landscapes
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
217,574. Debrie, A. L. V. C. June 12, 1923, [Convention date]. Optical-projection apparatus.-The light source in a kinematograph projector comprises an incandescent electric lamp having two or more filaments of the same or different illuminating powers; the filaments may be used simultaneously or separately, and may be put into or out of circuit by hand control or by means operating automatically in accordance with the speed of the film. As shown, the lamp has three filaments 7, 8, 9 connected to four lead wires 3 - - 6. Automatic control may be effected by a centrifugal device operating a circuit-breaker.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR217574X | 1923-06-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB217574A true GB217574A (en) | 1924-12-04 |
Family
ID=8881331
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB13371/24A Expired GB217574A (en) | 1923-06-12 | 1924-05-30 | Improvements in illuminating devices for cinematographic projection apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB217574A (en) |
-
1924
- 1924-05-30 GB GB13371/24A patent/GB217574A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CH311971A (en) | Electric light bulb with reflector. | |
GB217574A (en) | Improvements in illuminating devices for cinematographic projection apparatus | |
CH204632A (en) | Electric light bulb. | |
AU274112B2 (en) | Apparatus for projecting images from cinematographic film including an electric incandescent projection lamp with two filaments of differing power rating | |
GB336114A (en) | Improvements in fire preventing means for cinematograph projection apparatus combined with means for automatically switching on theatre lights | |
CH202656A (en) | Electric mixed light lamp. | |
AU3254363A (en) | Apparatus for projecting images from cinematographic film including an electric incandescent projection lamp with two filaments of differing power rating | |
GB234558A (en) | Improvements in photographic projection devices | |
CH310973A (en) | Electric light source. | |
FR1111593A (en) | Bright projector, particularly arc projector for cinema, capable of providing high intensity illumination for the film to be projected | |
CA438013A (en) | Diffusing projector lamp | |
GB411835A (en) | Means for reproducing film pictures by means of a screen of electric lights | |
CH205006A (en) | Electric light bulb. | |
GB447074A (en) | Improvements in or relating to electric incandescent lamps | |
FR505500A (en) | Automatic device for switching on and off electric lamps | |
FR539621A (en) | Automatic emergency lighting device for electric lamps and headlights | |
GB254906A (en) | Improvements in or relating to projectors for stationary films | |
AU156840B2 (en) | Improvements in electric circuit arrangements for operating electric discharge lamps | |
CA368643A (en) | Light projection apparatus | |
GB482705A (en) | Improvements in the projection of lantern slides | |
GR13100B (en) | LIGHT POWDER CAN BE USED AS AN ELECTRIC LAMP. | |
AU102063B2 (en) | Incandescent light source | |
AU106679B2 (en) | Improvements in electric discharge lamps adapted for use as sources in optical projection apparatus | |
AU110258B2 (en) | Improvements in electric discharge lamps adapted for use as sources in optical projection apparatus | |
AU131692B2 (en) | Lamps for cinematograph studios and for similar uses |