Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

634 Molesworth’s pocket-book Segment of Circles. V = Versed sin. 0 = Semichord. R — Badius. O = Any ordinate. X = Distance of ordinate from centre. O = V R2“- X" - (R — V). V2 + c2 „ x V2 + C2 R = .. — or diameter----—— * V = K - X = /R^_(0 + R - V)2.______ Area of segment = -g- V (O1626 V)2 + C2- Conic Sections. Section on plane A B, the line of axis forms a Triangle. Ditto on C D, parallel to the base forms a Cikcle. Ditto on E F at an angle to the base forms an Ellipse. Ditto on G H, parallel to the slope of the cone forms a Parabola. Ditto on J K, cutting the side at an angle less than para- bola forms a Hyperbola.