creases changes through which the ordinate of while the other decreases. Considered the parabola sketched above passes. The analytically, not practically, it is an uni- generatrix of the lateral surface passes versal rule that between any limits, the through the same changes as does the amount of… … faces cross at the same section. Here the motion of a varying triangle, which remains parallel to one plane, while its the area of generatrix is zero; but im- mediately on each side it is positive, as vertices are constrained to follow any the product of two positive or of two three straight lines.…
Engineering
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
