Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 41
aduations are very fine. In using a protractor a verysharp hard pencil should be used so that the lines will be fineand accurate. The protractor should be placed so that the given line ( pro 87 2tf MECHANICAL DRAWING. duced if necessary) coincides witli the two O maiks. Thecenter of the circle… … Fig. 21). outfit is the French or irregular curve. It is made of wood,hard rnbljer or celluloid, the last named material being the best.It is made in various shapes, two of the most common being
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