During new and full moon, the earth, moon, and sun are all in the same straight line, but, that during…
Bench centers are used to check concentrically, parallelism and true rotations of manufactured products.
Illustration showing a centroid, "the curve passing through the successive positions of the instantaneous…
Possible forms of the invariable cone by means of the intersections with a concentric spherical surface.
"Since these curves are not closed, one pair cannot be used for continuous motion; but a pair of such…
"If two equal ellipses, each turning about one of its foci, are placed in contact in such a way that…
Illustration of the rolling of equal hyperbolas. If two equal hyperbolas are placed so that the distances…
Illustration of the rolling of equal parabolas. "The two parabolas may be considered as two ellipses…
"The Gyroscope is an instrument constructed by M. Foucault to make the rotation of the earth visible.…
"Foucault's Gyroscope. GYROSCOPE. An instrument consisting of a fly-wheel, the axis of which can turn…
"Gyrostat. An instrument for illustrating the dynamics of rotation, composed of a box or case having…
Illustration showing how a rolling logarithmic spiral can be constructed by taking successive values…
Illustration showing the rolling of two logarithmic spirals of equal obliquity.
If the earth were uniformly covered with a layer of water, the passage of the moon over any place as…
"Let S be the Sun, E the Earth, and A, B, C, D, F, the Moon in different parts of her orbit. Now when…
Illustration showing that the rolling of non-cylindrical surfaces. "If the angular velocity ratio of…