Benjamin, Charles Henry, 1856- [from old catalog], Hoffman, James David, 1868- [from old catalog] joint author · New York, H. Holt and company · leaf 298
ty of the section. In applying the formula /Sj = —^ exercise care in obtain- ^{t or c) ing a satisfactory value for Z in the unsysmmetrical section. Toget Z it will be necessary to determine the moment of inertia I ofthe section and then find Z by the following: for tension Zt= - for compression Zc… … any line of reference as ah, take the algebraic sum of the moments ofeach rectangular section about this line of reference and divide bythe total area; this will give the distance x between the line of referenceand the gravity axis gg of the section, ab may be taken at anyposition in the section…
Machine design
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