, supported as shown, and around the pulley on the with tongues fitted to the grooves of the board, a screw being inserted in the clamping pieces for drawing screw. The screw is rapidly revolved, and the frame by which them into contact with the edges of the board, as shown it is supported is… … 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. When the disk has made one revolution, rod and permit of turning the rod for the…
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