Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 132
Fig. U. rule, which is applicable for any number of pieces: Let the toppiece of the elbow represent 1, also the lower piece 1, and for everypiece between the top and bottom add 2. Thus in a three-piecedelbow: Top piece equals 1 Bottom i)iece equals 1 One piece between 2 Total equals 4 Now divide…
Architecture · Building · Carpentry
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