The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 325
t, in the clear betw^een the bearings;and ^, a decimal in proportion to unity as the safe weight is tothe breaking weight. This is usually from 0-2 to 0*3, or fromone-fifth to one-third, at discretion. 430.—^Beams of this form, laid in series, are much used insustaining brick arches turned over… … ri?. 278. For this use the depth of cross section at middle equals (202.) 9000 t a The area of the bottom flange equalscfP a z= (203.) 9000 t d where the symbols signify as before, and c equals the distanceapart from centres in feet at which the beams are placed, andf the weight per superficial…
Carpentry · Architecture
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