"The only general of revolution which can degenerate into a cylinder, a cone, or a plane is the hyperboloid."

"Rotation of a ... forms a hyperboloid in which the hyperbola becomes a meridian of this surface..."

"All screws of a given pitch belonging to a system of the third order are the generators of a certain hyperboloid. The…"

"[F]or the hyperboloid of one sheet and the hyperbolic paraboloid the curvature is negative at every point."

"Upon the hyperboloid of one sheet, and likewise upon the hyperbolic paraboloid, the two lines of striction coincide."

"When an hyperboloid of revolution of one sheet is deformed into another ruled surface, the circle of gorge becomes a …"

"One way to deal with the matters... is to work with a set of numerical values. I can do this with the help of Ball's …"

"The equation of the tangent plane at the point (a, 0, 0) of the conicoid \frac{x^2}{a^2} \pm \frac{y^2}{b^2} \pm \fra…"

"Suppose we start with a disk radiator and we place a mirror in the form of a hyperboloid of revolution coincident wit…"

"[F]or the bare hyperboloid, both real and Lambertian sources are in the same plane. This is a limitation in certain a…"