Barrows, F. W. (Frank Wilson), b. 1853 · New York, N.W. Henley Pub. Co. · leaf 175
, this may be done very accurately. In this tool, the rod s should be perpendicular to base k.The collar / is made to slide on s, and is clamped by screwm; there is another collar n, which is always free to revolveon 5. This has a pin on each side, one of which is shownat 0. These pins should be… … Fig. 68. of rod 5 and also to centre of pin 0. In use, the instrumentshould be made fast to the spider of wheels by screwsthrough the base k. Of course the spider should be truewith the rim; then locate the pin 0 by the line across its MAKING GEAR PATTERNS. I7S centre at a distance equal to the…
Patternmaking
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