Handbook of mechanical and electrical cost data, giving shipping weights, capacities, outputs, and net prices of machines and apparatus, and detailed costs of installation, maintenance, depreciation and operation, together with many principles and data relating to engineering economics (1918)
Gillette, Halbert Powers, 1869-, Dana, Richard Turner, 1876-1928, joint author · New York, McGraw-Hill · leaf 1055
ork, those for special factory illum-ination should be used. The lamps should be provided with suit-able reflectors, in order to direct as much of the light as possibleon the work. There is a great variety of these reflectors, but theycan all be grouped in a few general classes, each of which is… … ceiling. The best example of this type is the prismatic Holo-phane. In order to have a good distribution of light, it is neces-sary to employ the proper style of reflector; hence a different sizeis manufactured for each size of tungsten lamp. It is necessaryalso to use the right type of shade…
