GB772253A - Improvements relating to electrical apparatus - Google Patents

Improvements relating to electrical apparatus

Info

Publication number
GB772253A
GB772253A GB433654A GB433654A GB772253A GB 772253 A GB772253 A GB 772253A GB 433654 A GB433654 A GB 433654A GB 433654 A GB433654 A GB 433654A GB 772253 A GB772253 A GB 772253A
Authority
GB
United Kingdom
Prior art keywords
oscillator
condenser
forms
fielden
voltage
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
GB433654A
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.)
Fielden Electronics Ltd
Original Assignee
Fielden Electronics 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 Fielden Electronics Ltd filed Critical Fielden Electronics Ltd
Priority to GB433654A priority Critical patent/GB772253A/en
Publication of GB772253A publication Critical patent/GB772253A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/266—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Oscillators With Electromechanical Resonators (AREA)

Abstract

772,253. Automatic voltage control systems. FIELDEN ELECTRONICS, Ltd., and FIELDEN, J. E. Jan. 21, 1955 [Feb. 15, 1954], No. 433C/54. Class 38 (4). [Also in Group XXXVI] The amplitude of oscillation of a Hartley oscillator 10 is stabilized by measuring the voltage across the tank circuit 13, 14 by means of a coil 21 and rectifier 30. The rectified output is applied to a meter 17 the moving element of which forms a variable condenser. This condenser, in series with condenser 15, forms a potential divider in the grid circuit of the valve to correct the feed-back voltage of the oscillator. The output of the oscillator is coupled to a capacity bridge for measuring liquid levels (see Group XXXVI).
GB433654A 1954-02-15 1954-02-15 Improvements relating to electrical apparatus Expired GB772253A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB433654A GB772253A (en) 1954-02-15 1954-02-15 Improvements relating to electrical apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB433654A GB772253A (en) 1954-02-15 1954-02-15 Improvements relating to electrical apparatus

Publications (1)

Publication Number Publication Date
GB772253A true GB772253A (en) 1957-04-10

Family

ID=9775258

Family Applications (1)

Application Number Title Priority Date Filing Date
GB433654A Expired GB772253A (en) 1954-02-15 1954-02-15 Improvements relating to electrical apparatus

Country Status (1)

Country Link
GB (1) GB772253A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4648115A (en) * 1983-09-22 1987-03-03 Casio Computer Co., Ltd. Pan-pot control apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4648115A (en) * 1983-09-22 1987-03-03 Casio Computer Co., Ltd. Pan-pot control apparatus

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