GB406649A - Improvements in electrical signalling devices and methods of operation thereof - Google Patents

Improvements in electrical signalling devices and methods of operation thereof

Info

Publication number
GB406649A
GB406649A GB2400332A GB2400332A GB406649A GB 406649 A GB406649 A GB 406649A GB 2400332 A GB2400332 A GB 2400332A GB 2400332 A GB2400332 A GB 2400332A GB 406649 A GB406649 A GB 406649A
Authority
GB
United Kingdom
Prior art keywords
obturator
circuit
armature
light signal
methods
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
GB2400332A
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.)
FRANK WIDNALL
British Thomson Houston Co Ltd
Original Assignee
FRANK WIDNALL
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 FRANK WIDNALL, British Thomson Houston Co Ltd filed Critical FRANK WIDNALL
Priority to GB2400332A priority Critical patent/GB406649A/en
Publication of GB406649A publication Critical patent/GB406649A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

406,649. Visible-signalling apparatus. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London, and WIDNALL, F., 95, Grosvenor Road, Rugby. Aug. 27, 1932, No. 24003. [Class 118 (ii).] To provide an intermittent light signal, a shutter is oscillated before a fixed source of light, the moving force being derived from the varying permeability of an iron magnetic' circuit in an A.C. field. As described, the obturator 3, which has an aperture 4 and carries armature 9, is carried by the cantilever device comprising springs 6, 7 and support 8. When alternating current is connected to the circuit comprising condensers 15, 16 and inductance 11, the armature 9 reciprocates across the pole pieces of the mag. netic core 10 and consequently the obturator 3 oscillates and produces an intermittent light signal. Specifications 379,711 and 385,312, [both in Group XXXV], are referred to.
GB2400332A 1932-08-27 1932-08-27 Improvements in electrical signalling devices and methods of operation thereof Expired GB406649A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2400332A GB406649A (en) 1932-08-27 1932-08-27 Improvements in electrical signalling devices and methods of operation thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2400332A GB406649A (en) 1932-08-27 1932-08-27 Improvements in electrical signalling devices and methods of operation thereof

Publications (1)

Publication Number Publication Date
GB406649A true GB406649A (en) 1934-02-27

Family

ID=10204833

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2400332A Expired GB406649A (en) 1932-08-27 1932-08-27 Improvements in electrical signalling devices and methods of operation thereof

Country Status (1)

Country Link
GB (1) GB406649A (en)

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