GB530456A - Improvements in or relating to control systems employing light-sensitive electric valves - Google Patents

Improvements in or relating to control systems employing light-sensitive electric valves

Info

Publication number
GB530456A
GB530456A GB18378/39A GB1837839A GB530456A GB 530456 A GB530456 A GB 530456A GB 18378/39 A GB18378/39 A GB 18378/39A GB 1837839 A GB1837839 A GB 1837839A GB 530456 A GB530456 A GB 530456A
Authority
GB
United Kingdom
Prior art keywords
grid
photo
control circuits
current
resistance
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
GB18378/39A
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.)
British Thomson Houston Co Ltd
Original Assignee
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB530456A publication Critical patent/GB530456A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/046—Sensing longitudinal register of web

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

530,456. Photo-electric control circuits. BRITISH THOMSON-HOUSTON CO., Ltd. June 23, 1939, No. 18378. Convention date, June 23, 1938. [Class 40 (iii)] [Also in Groups XXXV and XXXVII] Two photo-electric cells 30, 31 are connected in series across a D.C. source 32 and variation in the relative currents through them is caused to vary in opposite senses the currents in a pair of control circuits 28, 29 containing grid-controlled discharge devices 37, 49 respectively. The grid 40 of the device 37 is responsive to the potential change at the junction of the photo-electric cells whereby current in this device is varied and a resistance 54 in series is arranged to vary the potential of the grid 52 of the device 49 so as to cause an opposite change in the current on that device. The operation is accelerated by a condenser-resistance combination 46, 47 in the grid circuit of the device 37. In a modification the devices 37, 39 are replaced by a double triode having a resistance in its common output circuit maintaining the total current constant as well as controlling the mutually opposite current variations in the control circuits 28, 29.
GB18378/39A 1938-06-23 1939-06-23 Improvements in or relating to control systems employing light-sensitive electric valves Expired GB530456A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US530456XA 1938-06-23 1938-06-23

Publications (1)

Publication Number Publication Date
GB530456A true GB530456A (en) 1940-12-12

Family

ID=21981577

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18378/39A Expired GB530456A (en) 1938-06-23 1939-06-23 Improvements in or relating to control systems employing light-sensitive electric valves

Country Status (1)

Country Link
GB (1) GB530456A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2916703A (en) * 1956-08-14 1959-12-08 Gerber Prod Photoelectric sensing device
US3225646A (en) * 1961-07-07 1965-12-28 Tokyo Optical Photo-conductive exposure meter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2916703A (en) * 1956-08-14 1959-12-08 Gerber Prod Photoelectric sensing device
US3225646A (en) * 1961-07-07 1965-12-28 Tokyo Optical Photo-conductive exposure meter

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