Pomilio, Ottorino · New York, McGraw-Hill · leaf 255
t fixed uponthe space allowed its section; this for instance is the case offuselage longerons. Then the product E X I (elastic mod-ulus X moment of inertia), is of interest for the resistanceof the piece. Let us suppose that the longeron has a square section ofside X. We then have 1 . / = 12 240… … DOUGLAS FIR ELM Fig. 150. Let US call /i and 12 the moments of inertia which thesection must have respectively, according as to whether it ismade of one or the other quality of wood. If we wish thepiece to have the same resistance in both cases thenEili = E2I2 MATERIALS 241 that is from which W, xi…
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