Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 453
nonagon is 40°,the angle subtended by its sides 140°, and its area when the side is 1 =61818242, consequently thesquare of the side X 61818242 will give the area of the figure. NORMAL. A term sometimes used for perpendicular. In the geometry of curve lines, the normalto a curve at any point is a… … where the chief business is the construction of the morefinished quality of machinery. In these the nuts are usu-ally dressed to correspond with the other parts of the work.It is not commonly employed by millwrights, although itsuse would often be a material saving of time in the fitting-shop, and…
Mechanical engineering · Mechanics · Engineering
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