Barrows, F. W. (Frank Wilson), b. 1853 · New York, N.W. Henley Pub. Co. · leaf 176
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… … Fig. 69. placed by the circular base. Then the straight-edge is freeto move aU around the wheel, and if you work off the teethso that it will touch the whole surface you will have a prettygood wheel. CHAPTER VII. PROPELLER WHEELS. I dont propose to go into any scientific discussion of themerits of…
Patternmaking
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![An illustration from Cosmographia Francisci Mavrolyci Messanensis Sicvli : in tres dialogos distincta, in quibus de forma, situ numerʹoq[ue] tam coelorum q[uam] elementorum, alijsq[ue] rebus ad astronomica rudimenta spectantibus satis disseritur (1543)](https://img.insideoutlibrary.com/img/200/ia-cosmographiafran00maur-177-0.webp)
