GB332908A - Improvements relating to the detection and measurement of electric currents or voltages - Google Patents

Improvements relating to the detection and measurement of electric currents or voltages

Info

Publication number
GB332908A
GB332908A GB291929A GB291929A GB332908A GB 332908 A GB332908 A GB 332908A GB 291929 A GB291929 A GB 291929A GB 291929 A GB291929 A GB 291929A GB 332908 A GB332908 A GB 332908A
Authority
GB
United Kingdom
Prior art keywords
grid
resistance
junction
valve
potential
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
GB291929A
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.)
VICTOR HENRY GILBERT
Radiovisor Parent Ltd
Original Assignee
VICTOR HENRY GILBERT
Radiovisor Parent 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 VICTOR HENRY GILBERT, Radiovisor Parent Ltd filed Critical VICTOR HENRY GILBERT
Priority to GB291929A priority Critical patent/GB332908A/en
Publication of GB332908A publication Critical patent/GB332908A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
    • G01R19/16514—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using electronic tubes

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)

Abstract

332,908. Gilbert, V. H., Johnson, A. H., and Radiovisor Parent, Ltd. Jan. 28, 1929. Light-sensitive cells.-A selenium cell 1 is connected in series with a fixed resistance 9 and a battery 10. A neon tube 2 is connected between the junction of the resistance 1, 9 and the grid of a thermionic valve 11, in the anode circuit of which is a relay 16. A grid leak 17 of the order of 10 megohms is connected as shown. Befoxe ionization takes place in the tube 2, the grid of the valve 11 is insulated and a large anode current flows. When the potential difference at the junction of the resistance 1, 9 due to the impressed current is sufficiently great, ionization takes place in the neon tube 2, impressing a high negative potential on the grid of the valve and consequently reducing the anode current to a low value. The resistance 9 consists of a second selenium cell kept under constant illumination. Changes of atmospheric temperatures then affect both cells equally and cause no change in the potential at their junction.
GB291929A 1929-01-28 1929-01-28 Improvements relating to the detection and measurement of electric currents or voltages Expired GB332908A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB291929A GB332908A (en) 1929-01-28 1929-01-28 Improvements relating to the detection and measurement of electric currents or voltages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB291929A GB332908A (en) 1929-01-28 1929-01-28 Improvements relating to the detection and measurement of electric currents or voltages

Publications (1)

Publication Number Publication Date
GB332908A true GB332908A (en) 1930-07-28

Family

ID=9748538

Family Applications (1)

Application Number Title Priority Date Filing Date
GB291929A Expired GB332908A (en) 1929-01-28 1929-01-28 Improvements relating to the detection and measurement of electric currents or voltages

Country Status (1)

Country Link
GB (1) GB332908A (en)

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