the world, for showing the declination of the sun, moon, and stars; and each quarter of the solstitial colure, from the ecliptic as e and f, to its poles b and d, for showing the latitude of the stars.

In the north pole of the ecliptic is a nut b, to which is fixed one end of the quadrantal wire. To the other end is a small sun Y, which is carried around the ecliptic B--B, by turning the nut. In the south pole of the ecliptic is a pin d, on which another