Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 258
while the other side is extended ; and therefore, where extensionterminates and compression begins, there is a lamina or surface, g 7i, which isneither extended nor compressed, called the neutral surface. As the strainsare proportional to the distance from this surface, the material of which the… … FiG. 476. Fig. 477. Fig. 478. son found that the strength of cast-iron to resist compression is about six timesthat to resist extension ; the top web is therefore made only one sixth the areaof the lower one. The depth of the beam is generally about one sixteenth ofits length, the deeper of course…
Mechanical drawing
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