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September 12th 2013 | Paperback | PDF, EPUB, FB2, DjVu, audiobook, mp3, ZIP | 32 pages | ISBN: 9781230309781 | 6.30 Mb

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1857 edition. Excerpt: ...parallel with it--equalMoreThis historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher.

Not indexed. Not illustrated. 1857 edition. Excerpt: ...parallel with it--equal to PRC, the angle formed by the purlin post and the girder at their intersection at K. t The following geometrical demonstration of the above proposition is subjoined. In the two similar triangles ACP and POR, the sides about the equal angles are proportional (Def.

31)- and we have, CP: AC:: OR: OP- but CP is j of AC- consequently, OR is 1 of OP. But OP equals 6 feet- hence, OR equals 4 feet. Again, the triangle POR being right-angled at 0, then PO+OR=PR. 4=16, and 0=86- 86+16=62, And y/.V2 P--7 ft. 2.52 in., as above. Purlin Foit Brace. The brace of the purlin post must next be framed, and also the mortices for it, one in the purlin post and the other in the girder. The length of the brace and the lower end bevel of it will be the same as in a regular 3 feet run- and the upper end bevel would also be the same, provided the purlin post were to stand perpendicular to the girder- but, being square with the rafter, it departs further and further from a perpendicular, as the rafter approaches nearer and nearer toward a perpendicular- and the upper end bevel of the brace varies accordingly, approaching nearer and nearer to a right angle as the bevel at the foot of the post, or, what is the same thing, the upper end bevel of the rafter departs further and further from a right angle.

Hence, the bevel at the top of this brace is a COMPOUNd Bevel, found by adding the lower end bevel of the brace to the upper end bevel of the rafter. (See Plate 8.) Purlin Post Brace Mortices. In framing the mortices for the purlin post braces, it is to be observed, also, that if the purlin post were perpendicular to the girder, the mortices would each of them be 3 feet from the heel of the post- but as the post...

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