Abstract
The practical conditions controlling the accuracy of measurement of daylight factor are considered in the first section of the paper. A simple portable photoelectric daylight factor meter, incorporating two rectifier photoelectric cells, is described. The direct range of daylight factor measurable by the meter is from 0.03 per cent to 2.5 per cent. The limits of error in the measurement of daylight factor by means of the meter are considered to be about ± 10 per cent, so that the accuracy compares favourably with that normally obtainable by visual methods of measurement. No calculation need be involved in practical working, for the daylight factor can be related to the value of a variable balancing resistance included in the meter circuit. Curves relating daylight factor and resistance are given.
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