Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 276
ifficulty which attends all combustion: LIGHT 227 atmospheric conditions which vary from hour to hour, from placeto place, greatly affect the intensity of a flame. Hence incan-descent lamps, which have been compared with these fundamentalstandards, are used as working- standards. They can be… … ment of light demands extreme care, and, at the best, can neverapproach the accuracy of other laboratory measurements. Manyphotometers have been invented, some of them highly elaborate,but the type oftenest used remains in essence the simple instru-ment long ago devised by Bunsen. On a frame…
Inventions · Inventors
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