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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
18 to $48, the higher priced ones having a brass dial and dial for seconds, and the moon's age, and a more costly case. Brass clocks with a case cost from $38 to $60. Terry used a hand-engine for cutting the teeth of the wheels and pinions, and a foot-lathe for the turned work. In November, 1797, he patented an improvement in clocks, watches, and time-pieces, covering a new construction of an equation clock, showing the difference between apparent and mean time. In 1802, in which year Willard of Boston took a patent for his time-pieces, Terry began the business on a larger scale by water power. In 1814 he introduced a new era in the business by commencing on the Naugatuck River the manufacture of the shelf or mantel clock, which he patented in 1816. The cheapness of these created a wide demand. Several improvements made by him in the mechanism, and the later progress in machinery generally, have increased the annual production in that State to hundreds of thousands, and give
Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
arth-belt, is shown in Fig. 1894. It has adjustment for depth of cut, and the dirt excavated by the hollow share is carried upwardly and backwardly by the shovel-belt and dropped into the chute, which discharges it at the side of the trench. Willard's excavator. Willard's excavator, which has been so widely used in making railway embankments in the broad West, is shown in Fig. 1895. Its principal use in practice has been to dig soil by the side of the track and dump it on to the road, tWillard's excavator, which has been so widely used in making railway embankments in the broad West, is shown in Fig. 1895. Its principal use in practice has been to dig soil by the side of the track and dump it on to the road, to form a bed for the ballast and sleepers. The earth is scraped up by the shovel, carried between the wheel and a traveling apron, and dropped into a hopper. When this is full, the machine is drawn on to the site of the road and the load dumped. Chapman's excavator. The excavator (Fig. 1896) is mounted on a carriage which traverses on a temporary track. At one end of the frame is a crane, which has a circular adjustment on its axial post. To the end of the chain-tackle is suspended a