A text book of elementary mechanics, for the use of colleges and schools (1881)
Dana, Edward Salisbury, 1849-1935 · New York, J. Wiley & sons · leaf 191
A£ … Fig. 95. Fig. 96. Fig. 97. Fig. 98. from the vertices to the middle points of the oppositesides; in the square (Fig. 96), at the intersection ofthe lines joining the middle points of the two oppositesides, or of the dotted lines joining the opposite angles;m the regular pentagon (Fig. 97), at the…
Mechanics
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