Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen .. (1897)
Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The author · leaf 52
R::.IS:JR or D F^: D Z::JF^: JR. Since /S and its equal .7F^ are greater than /R, and the ratio JF^ to JR is constant, theproposition is established. 141. For the jiarabola on the lower napj^e, since the plane Mek is inclined at the angle &made by the elements, we have Q A= Q B (opposite equal… … •See Eemark, Art. 4. 46 THEORETICAL AND PRACTICAL GRAPHICS. 142. For the ellipse K s H, (Fig. 91), we have PX and iVT as the lines to be i^roven direc-trices, and F and F^ the points of tangency of two spheres. Let s be any point of the curve underconsideration and VL the element containiiag s.…
Mechanical drawing · Lettering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
