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 49
. Referring back to Fig. 35, it will be noticed that the focus and directrix of the jjarabolaare there omitted; but the former would be the point of intersection of a perpendicular from Aupon the line joining C with E. A line through A, parallel to O E, would be the directrix. 129. Like the… … F^D = A C (the transverse axis), it is the difference of the radii ^^s- sa. that is constant for the hyperbola. In Fig. 83, if J. -B is to be the transverse axis of thetwo arcs, or branches, which make the comijlete hyperbola,then using p and p to represent any two focal radii, as F Qand Fi Q, or…
Mechanical drawing · Lettering
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