Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 846
fitted in the twobent wires in the holder (fig.784), which are in contact withthe binding screws, and thusallow a current to be transmitted.The spring wire exerts an up-ward pressure, so as to alwaysensure good contact. To theother ends of the platinum arefixed the characteristic part, thecarbon… … Fig. 783- Fig. 784. known as vegetable parchment. This is then carbonised by heating it to ahigh temperature in closed vessels. Before sealing the bulb it is exhaustedof air by means of a Sprengel pump, and the vacuum is so perfect that elec-tricity does not pass in it. The carbon of such a lamp,…
Physics
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