Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 203
Fig. 352. Fig. 353. Fig. 354. Fig. 355. a centre of symmetry (a point which bisects all straight lines drawn through it), thispoint coincides with the centre of gravity. The middle of a straight line, the centre ofa circle, the intersection of the diagonals of a parallelogram, the intersection of…
Mechanical drawing
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