GB356944A - Improvements in or relating to photometric apparatus - Google Patents

Improvements in or relating to photometric apparatus

Info

Publication number
GB356944A
GB356944A GB2707230A GB2707230A GB356944A GB 356944 A GB356944 A GB 356944A GB 2707230 A GB2707230 A GB 2707230A GB 2707230 A GB2707230 A GB 2707230A GB 356944 A GB356944 A GB 356944A
Authority
GB
United Kingdom
Prior art keywords
resistance
lamp
voltage
measuring
valve
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
GB2707230A
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.)
GORDON THOMAS WINCH
General Electric Co PLC
Original Assignee
GORDON THOMAS WINCH
General Electric Co PLC
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 GORDON THOMAS WINCH, General Electric Co PLC filed Critical GORDON THOMAS WINCH
Priority to GB2707230A priority Critical patent/GB356944A/en
Publication of GB356944A publication Critical patent/GB356944A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors

Abstract

356,944. Photometric apparatus. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, and WINCH, G. T., of General Electric Co., Wembley, Middlesex. Sept. 10, 1930, No. 27072. [Class 97 (i).] Apparatus for measuring the efficiency of a lamp, either in lumens per watt or in watts per candle, comprises in the first case means for generating voltages Ef, Ei, Ev proportional respectively to the lumens, the current passing through the lamp, and the supply voltage, and then measuring Ef-Ei-Ev. In the second case a voltage Ec proportional to candle-power in a chosen direction is generated and Ei+Ev-Ec is measured. The lamp 5 irradiates a photoelectric cell 1 either by its integrated illumination or by light in a chosen direction and the output from the cell is amplified by a valve 2. The voltage Ev is obtained from a resistance R3 placed in series with a resistance R4 across the lamp terminals and Ei from a resistance R3 in series with. the filament. The voltage Ef, or Ec is obtained from a resistance R2 in the anode circuit of the valve. The voltmeter 3 gives the desired reading.
GB2707230A 1930-09-10 1930-09-10 Improvements in or relating to photometric apparatus Expired GB356944A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2707230A GB356944A (en) 1930-09-10 1930-09-10 Improvements in or relating to photometric apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2707230A GB356944A (en) 1930-09-10 1930-09-10 Improvements in or relating to photometric apparatus

Publications (1)

Publication Number Publication Date
GB356944A true GB356944A (en) 1931-09-17

Family

ID=10253702

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2707230A Expired GB356944A (en) 1930-09-10 1930-09-10 Improvements in or relating to photometric apparatus

Country Status (1)

Country Link
GB (1) GB356944A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5476222A (en) * 1991-06-20 1995-12-19 Sprayforming Developments Limited Metal spraying apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5476222A (en) * 1991-06-20 1995-12-19 Sprayforming Developments Limited Metal spraying apparatus

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