The frame should be made of brass plates | in. thick, and should measure 4 1/2 in. by 6in. The pillars (four) must be 3/8 in. diameter and 1 3/4 in. long between the plates. The barrels should be 1 1/2 in. diameter and 1 1/2in. long. For going train, use fusee main wheel of 96 teeth, 1 5/8 in. diameter; centre wheel of 84 teeth, 1 3/8 in. diameter, pinion 8 leaves; third wheel of 78 teeth, 1 5/16 in. diameter, pinion 7 leaves; 'scape wheel of 40 teeth, l 1/4 in. diameter, pinion 7 leaves. For motion work, use minute wheels of 36 teeth, |in. diameter; hour wheel of 72 teeth, l 1/4 in. diameter; minute pinion, 6 leaves. For striking train, use fusee main wheel of 84 teeth, 1| in. diameter; pin wheel of 64 teeth, 1 1/16 in. diameter (eight pins), pinion 8 leaves; pallet wheel of 70 teeth, lin. diameter, pinion 8 leaves; warning wheel of 60 teeth, lin. diameter, pinion 7 leaves; and fly pinion, 7 leaves. Either chains or gut lines can be used, but chains are best. The fusees must be cut for sixteen complete turns of the chains. On account of the small size of the movement, it can carry a light hammer spring only.

The pendulum will make 178 beats per minute, and will be of 4.3 in. acting length, which, with a 2-in. diameter brass bob, and allowing for suspension, will messure nearly 6 in. long over all, and just swing clear of the bottom of the case. The pendulum should be provided with the rating nut above the bob, after the usual pattern of English bracket clocks, and thus save the space occupied by a nut under the bob. The centre pinion, when made from pinion wire, is thickened at the front end by having the leaves at that part forged up solid. This method will be almost impossible in so small a clock as this, and if pinion wire be used, it would be advisable to drive on a steel collar to form the shoulder of the front pivot. In the accompanying sketch, A A are the barrels; BB, the fusees; C, centre wheel; D, third wheel; E, 'scape wheel; F, pallets; G, pin wheel; H, pallet wheel; I, warning wheel; and J, fly.

Eight-day Movement for a Lantern Clock.