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 1048
uced on thework rather than in terms of the watts per mean spherical c.p.is evidence that this item will probably be included in the con-siderations of lamp efficiency more in the future than in the past. Quantity of light is not the sole criterion of excellence; uni-formity over the work,… … Fig. 3. Chart showing relative average overall dimensions ofvarious lamps. One Candle Power. The recognized unit of lighting measure-ment is a candle-power per hour. This is an arbitrary unit, orig-inally the light emitted by a spermaceti candle burning 120 grainsper hour, known as the British…
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-401-252.webp)
