Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 101
ali<»nwould be roughly gauged l)y observingwhich of the values most nearly l)alaneedwith the existing illumination. He ex-hibited a model of an instrument of thistype (for the making of which he wasindebted to his hither). an<l showed ;i slide 00 THE ILLUMINATING ENGINEER (matich 1916)… … Fk;. 1.—Box Photometer (Mr. A.Cunnington). of tlie lioles in the middle diaphragm, andthus altering the area of the light sourceavailable. The light from the lamps inthe lower ]iart of the box shines throughopal glass, or other translucent materialto give uniformity of illumination, andthis lower…
Lighting
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