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 266
s A B or C A in Fig. 2640, is aradius. The word radius, of which radii is the plural, signifies a spoke of a wheel. It is evidentthat as each radius begins at the centre and is bounded at the opposite end by the circumference, allthe radii in any circle are equal, as are all the diameters. Fig.…
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