 | Charles Frederick Partington - 1825 - 342 páginas
...is horizontal, and tends to the axis of a spheric vaulting, that their mutual intersection must be in the circumference of a circle, the plane of which will be perpendicular to the horizon. Hence the beautiful fntersections of sphcro-cylindric groins, which are so much admired in... | |
 | John Fry Heather - 1851 - 156 páginas
...0 E'. Moreover, each of the series of spherical surfaces will cut the second surface of revolution in the circumference of a circle, the plane of which will be perpendicular to the vertical plane of projection, and of which the vertical projection will be obtained by drawing through... | |
 | Alphonse Andrew Adler - 1912 - 372 páginas
...point in space not in the plane containing BB. If A be revolved about BB as an axis, it will describe a circle, the plane of which will be perpendicular to the axis. In other words, A will fall somewhere on a line Ba" perpendicular to BB. The line Ba" must be perpendicular... | |
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Moreover, each of the series of spherical surfaces will cut the second surface of revolution in the circumference of a circle, the plane of which will be perpendicular to the vertical plane of projection, and of which the vertical projection will be obtained... 