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In improved meter, current outputs of 2 photoelectric cells are compared by null-balance method; when one cell is exposed inside building and other outside, ratio of illuminations at 2 positions is indicated directly on calibrated scale by balance position of potentiometer.
In improved meter, current outputs of 2 photoelectric cells are compared by null-balance method; when one cell is exposed inside building and other outside, ratio of illuminations at 2 positions is indicated directly on calibrated scale by balance position of potentiometer.
Daylight factor meter
J Sci Instruments
Turner, D.P. (author)
1960
2 pages
Article (Journal)
Electronic Resource
English
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