Barrows, F. W. (Frank Wilson), b. 1853 · New York, N.W. Henley Pub. Co. · leaf 192
f spiral you should make it right- or left-handed, as maybe wanted. Now you need a templet to draw the lines between thesepoints already found and which are intended to locate theline of spiral. Make your templet in this way: Fit a pieceof hard wood to the surface of the pattern five or six… … Fig. 84. straight edge equal to one of the spaces between parallellines on cylinder. Square across one end of the piece fortemplet. Then measure on the gauge line from thesquared Une a distance equal to one of the parts into whichthe pitch was divided. A spiral line drawn from this pointto the…
Patternmaking
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