The accompanying engraving illustrates an in genious and useful horological novelty that has re cently been perfected by an English inventor Mr. J. H. Overton and which is described as an Empire clock. As the name implies it is a universal time piece for not only does it give the correct time all over the world but supplies. in a glance the difference in the times between all places on the eatth's surface and the correct mean time at any town or place in the eastern or western hemisphere. Moreover it dem onstrates the actual rotation of the earth on its axis In the twenty-four hours as well as the actual speed of the earth. The clock is made in two sizes and patterns but the principle of design and operation is fundamentally the same in both instances. There is a terrestrial globe schools and suitably mounted. The diameter of this glove varies from 3 te 4 inches according to the size of the clock. It completes one revolution about its axis in the course of twenty-four hours in the same direction as the earth itself revolves. Parallel with the equator is a fixed ring dial upon which are in hours with sub-divisions the hours from 6 P. M. to 5.45 A. M. being engraved in black and from 6 A. M. to 5.45 P. M. in red to distinguish the twelve hours before and after meridian. The meridians of dian is adjusted to its own mean time all the other meridians denote their own mean time and each out the twenty-four hours. In order to determine conveniently the time at any desired spot on the earth's surface relative to another point such as New Yotk there is an adjustable and movable guide fitted with a pointer which turns with the globe and whereby the time is indicated in the hour ring just as the hand of an ordinary clock at any place. This guide is held in position by means of a small knob which enables it to be turned in an easterly direction without moving or changing the position of the globe and it can be set over any town where the chronosphere is to be permanently used.
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