Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 239
Fig. 71. Fig. 72. the stem of the pear. The lower portion of the tube isthen cut off with a file, and the carbon, with its platinumwires, fused into the upper half, after which the twoportions of the globe are joined together by the blow-pipe. The lamp is then exhausted of air, first by means of…
Electric industries · Electricity
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