Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 497
oints follow from the fact that limited portions falling within a given angle atthe pole are similar figures. Furthermore, the analytical relation of this spiral to the problem issimple. The odontograph is shown reduced in Fig. 3249. Its capacity is extended to any degree by simplyprolonging the… … from the passes of the scribe. It has several holes countersunk on both sides as shown, so that itmay be attached by wood-screws, or by bolts expressly prepared, to any convenient wooden rod, insuch a manner that when the rod swings around a centre-pin to the wheel all the laces of the teethmay be…
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