Mechanical Contracting & Plumbing January-December 1912 . e arc N M, as shown by 1,2, 3, 4, and 5. Draw a straight line from 1 to 2,2 to 3, etc., as shown. Then drawlines into the centre G, and bend thepattern on these lines. Allow for lap or fold, the size ofwhich varies according to the size ofthe article wanted. Prob. 11 represents a triangular orthree-sided pyramid, and is developed in practically the same manner as First draw the outline A B C, ofFig. 1. Then find the centre and drawthe lines into same as shown by A 0,B 0, and CO. (See prob. 12.) What we want to get now is the tr
Mechanical Contracting & Plumbing January-December 1912 . e arc N M, as shown by 1,2, 3, 4, and 5. Draw a straight line from 1 to 2,2 to 3, etc., as shown. Then drawlines into the centre G, and bend thepattern on these lines. Allow for lap or fold, the size ofwhich varies according to the size ofthe article wanted. Prob. 11 represents a triangular orthree-sided pyramid, and is developed in practically the same manner as First draw the outline A B C, ofFig. 1. Then find the centre and drawthe lines into same as shown by A 0,B 0, and CO. (See prob. 12.) What we want to get now is the truelength of the hips, so we draw the linesS U of Fig. 2, making it equal in lengthto any one of the hip lines as A C. Then we erect the vertical line S R,making it any height desired. Then a line drawn from R to U givesthe desired length of the hip. Set the compass to this space andwith either R or G as a centre describethe arc N M, and lay off on this thesides of the triangle. The total dis-tance around any straight-sided figureis called its Pattern r>q * Problem JO
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplumbin, bookyear1912
