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 50
CONIC SECTIONS. 43 … Similarly, if a tangent at R^ were wanted we may first find r, corresponding to R^; draw thetangent-?•/ to the small circle; then join J, (constant point), with R^. 133. Occasionally we have given the length and inclination of a pair of diameters of the elhpse,^ig-. as. making oblique angles with…
Mechanical drawing · Lettering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
