Page:Sheet Metal Drafting.djvu/220

206 hypotenuse of section A to 2, an arc is drawn bearing away from point 1. This is intersected by an arc drawn from point 1, with a radius equal to the distance 1-2 of the profile. This establishes point 2. With point 2 as a center and a radius equal to the upper base of section 2-B, an arc is drawn bearing away from point A. This is intersected at B by an arc drawn from point A, with a radius equal to distance AB of the profile. In this manner all the points of the pattern are located in the order previously adopted. Curved lines passing through these points give the half pattern for the entire frustum.