Osgood, William F. (William Fogg), 1864-1943, Graustein, William C. (William Caspar), 1888-1941, joint author · New York : The Macmillan Company · leaf 603
hat one of thefixed lines is the axis of z and the others have the equationsa; = c, 2; = my; x-=— c^z = — my, where cm 4^ 0. 22. A line moving so that it is always parallel to a fixedplane, 3/, and always intersects two fixed skew lines, neitherof which is parallel to 3f, generates a hyperbolic… … 1. Spherical Coordinates. Griven a point 0, a ray OA issu-ing from 0, and a half-plane m bounded by the line of the ray OA. Let P be any point of space. Join Pto 0 and construct the half-plane, v, deter-mined by OA and OP. Denote the distanceOP by r, the angle AOP by <^, and the anglefrom the…
![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-330-37.webp)
