Benjamin, Charles H[enry], 1856- [from old catalog] · New York, H. Holt and company · leaf 42
one great advantage overthe I section in that itsmoment of resistance to sidebending or to twisting is usually much greater. Thedouble I or the U section is common where it isnecessary to have two parallelways for sliding pieces as in lathesand planers. As is shown in Fig.5 the two Is are usually… … Fig. 4.
Machine design
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