Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 199
n filament ofone fifth greater efficiency than anordinary untreated filament. Fibersof the usual cellulose kind are en-closed in a carbon box, placed in a carbon-tube resistance furnaceheated to between 3,000° and 3,700° C. This converts the filamentinto a graphite of increased luminosity which,… … Alcohol lamp withventilating hood. NEW ELECTRIC LAMPS 159 metal remains unmelted at a very high temperature, but as alight-giver its quality is poor. Of late years investigators have
Inventions · Inventors
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