Woodwork for secondary schools; a text-book for high schools and colleges, prevocational and elementary industrial schools (1916)
Griffith, Ira Samuel, 1874-1924 · Peoria, Ill., Manual Arts Press · leaf 35
of the foot. The pitch of a rafter is the ratio ofthe rise of the rafter to the whole widthof the building. Thus, if the span, Fig. 30 WOODWORK FOR SECONDARY SCHOOLS. 29, should be 24 ft. and the rise 8 ft., the pitch would be i.The cuts of a rafter are obtained by placing the square so that the 12… … Fig. ,30. Square Placed for Plumb Cut. a 24 ft. span, and 8 rise to a 12 run. The line B gives theangle for the ridge or plumb cut; the line A gives the cutfor the foot of the rafter, the seat cut. To make use of the table. Fig. 28, first look at the inchline figures on the outside, or top edge, of…
Woodwork (Manual training)
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