The WIND-DIAL is lettered with the four cardinal points of the compass and the 12 intermediates. The hand which points on the dial is connected by rods and bevelled wheels with a vane at the top of the house, placed 20 feet above the roof in order to be affected, not by wind eddies, but by the true current of air. The connecting rods boxed in the wall are broken at every eight feet with universal joints, and hardened steel is used for all pivots and sockets. The dials are generally made of semi-transparent ground glass and are lit by gas after dark. In a set of Clock Calendars which I some time since provided for His Grace the Duke of Portland, the clock showed the time on four illuminated dials five feet nine inches in diameter, chiming quarters, hours, &c. (the well-known Cambridge chimes) on bells of 12 cwt., repeating the hour after the 1st, 2nd, and 3rd quarters. The two sides of an adjoining tower show a calendar similar to the one above mentioned, with the addition of an extra circle on the dial to mark the age of the moon and the equation of time, so that each dial has four circles, besides the circle of the moon, shifted simultaneously at 12 o'clock every night. SUN-DIALS (see illustration on following page) are chiefly used now to mark the solar meridian or noon. Those which indicate other hours have a gnomon with its edge parallel to the earth's axis and inclined to the horizon at the angle corresponding to the latitude of the place in which the dial is fixed. CARILLON CHIMES. +----------------------------------------------------------------------+ | [Illustration: Sun-Dial.] | +----------------------------------------------------------------------+