These pencils are made projective by aid of the conic in α1.
conic -al: cylindrical, with a flat base, tapering to a point.
Perhaps the conic sections, the cycloid, &c., might be advantageously added in such cases.
The mountain is remarkable for the perfection of its conic form.
Fruit medium, roundish, inclined to conic, sometimes obscurely ribbed.
The Confederacy has flanked the conic Section, and is trying to escape.
Two miles from the opening are the conic, and several low rocks, which were passed at the distance of one mile and a half.
Apollonius, conic Sections of, Hypatia's commentary on, 168.
Instead of a circle or sphere we may take any conic or quadric.
The conic sections which I described on that blackboard, the learned hieroglyphics!
["Dynamic Configuration for Distributed Systems", J. Kramer et al, IEEE Trans Soft Eng SE-11(4):424-436 (Apr 1985)].