ter of the disk. The central opening through | inch from the periphery of the revolving plate. The points could be desired, yielding a spark fully six inches in length, | which the sleeve, C, extends is approximately circular, but |should be as near the face of the revolving glass as_ possible… … being supported from the center, in diameter, the fixed disk is FAs |= faa | as usual with the apertured re- fourteen inches in diameter. I volving plate, is elongated and begin with the glass disks, as it is bent so as to enter the rear end here that most of the difficulty of the tube which forms…
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