Appletons' cyclopædia of technical drawing : embracing the principles of construction as applied to practical design ... (1896)
Worthen, W. E. (William Ezra), 1819-1897 · New York : D. Appleton · leaf 201
rHr- … Fio. 352. FIG. 353. Fm. 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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