Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

044 Molesworth’s pocket-book To Construct an Ellipse when the Diameters EO NOT Cl.ose ONE ANOTHER AT BIGHT ANGLES. Let A B and C D be the given diameters. Draw the bounding lines parallel to both diameters and divide the longest diameter in 11 any number of equal parts, also divide the shorter bounding lines into the same number ot equal parts. From one end of the shorter diameter! draw radial lines through the divisions of the longer diameter, and from the opposite end C draw radial lines to the divisions on the shorter bound, ing lines; the intersection of these lines will give points in the curve.