A history of the growth of the steam-engine . e in first cost, were WilliamBull and Richard Teevithick. The accompanyingillustration shows the design, which was then known asthe Bull Cornish Engine. The steam-cylinder, a, is carried on wooden beams, h,extending across the engine-house directly over the pump-well. The piston-rod, c, is secured to the pump-rods,d d, the cylinder being inverted, and the pumps, e, in theshaft, f, are thus operated without the intervention ofthe beam invariably seen in Watts engines. A connect-ing-rod, g, attached to the pump-rod and to the end of abalance-beam, h,
A history of the growth of the steam-engine . e in first cost, were WilliamBull and Richard Teevithick. The accompanyingillustration shows the design, which was then known asthe Bull Cornish Engine. The steam-cylinder, a, is carried on wooden beams, h,extending across the engine-house directly over the pump-well. The piston-rod, c, is secured to the pump-rods,d d, the cylinder being inverted, and the pumps, e, in theshaft, f, are thus operated without the intervention ofthe beam invariably seen in Watts engines. A connect-ing-rod, g, attached to the pump-rod and to the end of abalance-beam, h, operates the latter, and is counterbalancedby a weight, i. The rod, j, serves both as a plug-rod andas an air-pump connecting-rod. A snifting-valve, h, opens For an exceedingly interesting and very faithful account of theirwork, see Life of Richard Trevithick, by F. Trevithick, Loudon, 1872. THE CONTEMPORARIES OP JAMES WATT. 139 when the engine is blown through, and relieves the con-denser and air-pump, I, of all air. The rod, m, operates a. solid air-pump piston, the valves of the pump being placedon either side at the base, instead of in the pump-bucket, as 140 THE DEVELOPMENT OF THE MODERN STEAM-ENGINE. in Watts engiDes. The condensing-water cistern was awooden tank, n. A jet pipe-condenser, o, was usedinstead of a jet condenser of the form adopted by othermakers, and was supplied with water through the cock, plug-rod, q, as it rises and falls with the pump-rodsand halance-heam, operates the gear-handles, r r, andopens and closes the valves, s s, at the required points inthe stroke. The attendant works these valves hy hand, instarting, from the floor, t. The operation of the engineis similar to that of a Watt engine. It is still in use,with a few modifications and improvements, and is a veryeconomical and durable machine. It has not been as gen-erally adopted, however, as it would probably have been hadnot the legal proscription of Watts patents so seriously inter-fer
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
