to the result desired, filings length of 2 feet, the pitch of its thread being 6 to an inch. light and color, rather than the mere detonations calculated of cast and wrought iron, steel, copper, and zinc; dust of Now in 2 feet of the screw there would be 144 threads, and to impress the savage or… … composition. These are closely fixed perpen- The operation is as follows: The ordinary dicularly to frames of desired outline, and change wheels are connected to the feed screw, DEVICE FOR CORRECTING A LEADING SCREW or lead screw, as it is sometimes termed, their outer ends connected by a quick…
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