Page:History of the Royal Society.djvu/273

 A Copernican Sphere, representing the whirling Motion of the Sun, and the Motion of the several Planets.

A great many new ways of making Instruments, for keeping time very exactly, both with Pendulums, and without them; whereby the intervals of time may be measur'd both on the Land, and Sea.

A universal Standard, or measure of Magnitudes, by the help of a Pendulum, never before attempted.

A new kind of Pendulum Clock, wherein the Pendulum moves circularly, going with the most simple, and natural motion, moving very equally, and making no kind of noise.

A Pendulum Clock, shewing the æquation of Time.

Three new ways of Pendulums for Clocks, and several ways of applying the motion of the Watch-work to them.

Several new kinds of Pendulum Watches for the Pocket, wherein the motion is regulated, by Springs, or Weights, or Loadstones, or Flies moving very exactly regular.

Several forts of Instruments for compressing, and rarefying the Air: A Wheel-Barometer, and other Instruments for finding the pressure of the Air, and serving to predict the changes of the Weather.

A new kind of Scales, for examining the gravity of Bodies in all places: to see whether the attraction of the Earth, be not greater in some parts of the Earth, than in others; and whether it do not decrease, at farther distances from the surface of the Earth, either upwards into the Air, or downwards under the Earth.

A very exact pair of Scales, for trying a great number of Magnetical Experiments.

Rh