Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 87
(fzVh etc., and the sum of tbe moments (that is, tbe resisting moment) is S S S —^^ yl + —«2 y\ + etc. -- —(a, y\ + a., yl + etc.) Now <7, yl 4- ^2 yl-{- etc. is the sum of the pioducts obtained bymultiplying each infinitesimal part of tbe area of the cross-sectionby the square of its distance… … BLACKSMITH SHOP AT PENSHDRST, ENGLAND
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