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Rh a confusion of lines. It is recommended to the student that he make paper or metal models of this problem in order to understand thoroughly the basic principles involved.

50. Related Mathematics on Diagonal Offsets.—Problem 26A.—Sixteen-ounce cold-rolled copper costs 25¼ cents per pound. How much would twenty-four diagonal offsets, Fig. 144, cost? In finding the area of this fitting multiply the distance (perimeter) around the profile by the combined length of lines AB, BC, and CD of Fig. 142. Sixteen-ounce copper weighs 16 ounces to the square foot. Allow 5 per cent for locks.