t practically nothing. the carbon to its normal position, thus establishing plunged into cold water. This operation casehardens the arc. The experimental lamp shown in Fig. 1 consists of the iron, so that it will cut the wood without being The lamp is adapted to lantern use by grooving the two… … lathes. Of course, there is a limit to the size Fig. 2.-SIMPLE ARC LAMP FOR PROJECTION. of work possible with a light lathe, even mer until the threads engage the periphery of the though provided with back gear, the limit being de- helix of sufficient size to readily receive the carbon wooden disk.…
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