Carpenter . Side cut bevel for eleven-inch-to-foot pitch. 12 10-12, and so on. I add 5-12 inch forevery extra inch pitch. If the roof is 6inches to the foot pitch, I say: 6X5-12:=,,0-12=2y2. So placing one leg of thesquare at 12 and the other at 14% givesme my exact bevel. This is an excellentrule, especially when rafters are of variablethicknesses. For Spacing—If my main ratter on anyjob should happen to be say IG long, witha 6 to the foot pitch and space, say 18 oncenters. I say 6X5-12=30-12 or 2V2-To this I add 18 or the distance the mainrafters are on centers, making 20% orr 8%. Subtract t
Carpenter . Side cut bevel for eleven-inch-to-foot pitch. 12 10-12, and so on. I add 5-12 inch forevery extra inch pitch. If the roof is 6inches to the foot pitch, I say: 6X5-12:=,,0-12=2y2. So placing one leg of thesquare at 12 and the other at 14% givesme my exact bevel. This is an excellentrule, especially when rafters are of variablethicknesses. For Spacing—If my main ratter on anyjob should happen to be say IG long, witha 6 to the foot pitch and space, say 18 oncenters. I say 6X5-12=30-12 or 2V2-To this I add 18 or the distance the mainrafters are on centers, making 20% orr 8%. Subtract this from main rafter:16—r 8y2=14 3%. W3Vo is lengthof first jack. So each jack will be 1 8%shorter than the preceding one, measuringon a center line, of course, down the top ofrafter. To Mitre Plancher to Pitch of Roofof 6 or 12-inch Pitch (By James Barry, L. V. 509.)Figs. 1 and 2 above show the differencebetween six-inch and twelve-inch A to B is the bevel of face for three-.
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Keywords: ., bookauthorunitedbr, bookcentury1900, bookdecade1910, bookyear1911
