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From Gueth, Oswald. Mechanical Drawing. (NY: Theo. Audel and Company, 1913.) Scanned by the author from the original.
Note that although this illustration, published in 1913, is in the public domain, "Audel" is probably still an active trademark. It is used here only by way of identifying something that they published so long ago that it is now in the public domain.
All portions of this document not noted otherwise are Copyright © 2006-2007 by David M. MacMillan and Rollande Krandall.
Circuitous Root is a Registered Trademark of David M. MacMillan and Rollande Krandall.
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