GB330774A - Improvements in or relating to operating mechanism for projection apparatus - Google Patents

Improvements in or relating to operating mechanism for projection apparatus

Info

Publication number
GB330774A
GB330774A GB1863429A GB1863429A GB330774A GB 330774 A GB330774 A GB 330774A GB 1863429 A GB1863429 A GB 1863429A GB 1863429 A GB1863429 A GB 1863429A GB 330774 A GB330774 A GB 330774A
Authority
GB
United Kingdom
Prior art keywords
rod
notch
switch
motor
film
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
GB1863429A
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.)
PAUL HORRIS CROSS
ROBERT OWEN FORTUNE
Original Assignee
PAUL HORRIS CROSS
ROBERT OWEN FORTUNE
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 PAUL HORRIS CROSS, ROBERT OWEN FORTUNE filed Critical PAUL HORRIS CROSS
Priority to GB1863429A priority Critical patent/GB330774A/en
Publication of GB330774A publication Critical patent/GB330774A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

330,774. Fortune, R. O., and Cross, P. H. June 17, 1929. Optical-projection apparatus.-Apparatus for the step-by-step progression of a film through an optical lantern, so as to allow an interval between movements sufficiently long for the inspection of each picture, comprises a disc 29 rotated by a motor 24 and having a notch 30 which is engaged by a rod 34 forming the armature of electromagnets 31, 32. The rod 34 controls a switch 38 in the motor circuit. The magnets 31, 32 are in series with the secondary winding of a step-down transformer T, and their circuit is made at intervals by a clochcontrolled switch. Energizing of the magnets 31, 32 withdraws the rod 34 from the notch 30 and closes the switch 38 to start the motor 24 and rotate through gearing both the disc 29 and a film advancing toothed wheel 48. The rotation continues till the notch 30 comes round and allows the rod 34 to enter under the action of a spring 35. The lantern consists of a casing 10 having a screen 12 at one end, the objective 15 being adjustably held in the apex of a conical reflector 14. A frusto-conical member 22 directs light from the lamp 23 on the film 20. The device may be used for advertising, announcing, or as a station indicator on a vehicle. When employed as a station indicator, the clock is replaced by contact switches along the track.
GB1863429A 1929-06-17 1929-06-17 Improvements in or relating to operating mechanism for projection apparatus Expired GB330774A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1863429A GB330774A (en) 1929-06-17 1929-06-17 Improvements in or relating to operating mechanism for projection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1863429A GB330774A (en) 1929-06-17 1929-06-17 Improvements in or relating to operating mechanism for projection apparatus

Publications (1)

Publication Number Publication Date
GB330774A true GB330774A (en) 1930-06-19

Family

ID=10115807

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1863429A Expired GB330774A (en) 1929-06-17 1929-06-17 Improvements in or relating to operating mechanism for projection apparatus

Country Status (1)

Country Link
GB (1) GB330774A (en)

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