A history of the growth of the steam-engine . Pig. 88.—Watts Half-Trunk Engine, ITM. piston, and O its rod, encased in the half-trunk, D. Theplug-rod, 6r, moves the single pair of valves by striking thecatches, £J and JF] as was usual with Watts earlier engines. JAMES WATT AND HIS INVENTIONS. 123 Watts steam-hammer was patented at the same is seen in Fig. 34, in which A is the steam-cylinder andB its rod, the engine being evidently of the form just de-scribed. It works a beam, C C, which in turn, by the rod,. Fia. 84.—The Watt Hammer, 1784. M, works the hammer-helve, Z J] and the hamme
A history of the growth of the steam-engine . Pig. 88.—Watts Half-Trunk Engine, ITM. piston, and O its rod, encased in the half-trunk, D. Theplug-rod, 6r, moves the single pair of valves by striking thecatches, £J and JF] as was usual with Watts earlier engines. JAMES WATT AND HIS INVENTIONS. 123 Watts steam-hammer was patented at the same is seen in Fig. 34, in which A is the steam-cylinder andB its rod, the engine being evidently of the form just de-scribed. It works a beam, C C, which in turn, by the rod,. Fia. 84.—The Watt Hammer, 1784. M, works the hammer-helve, Z J] and the hammer, i. Thebeam, F G,\bz, spring, and the block, iVj the anvil. Watt found it impossible to determine the duty of hisengines at all times by measurement of the work itself,and endeavored to find a way of ascertaining the powerproduced, by ascertaining the pressure of steam withinthe cylinder. This pressure was so variable, and sub-ject to such rapid as well as extreme fluctuations, thathe found it impossible to make use of the steain-gaugeconstructed for use on the boiler. He was thus driven toinvent a special instrument for this work, which he calledthe steam-engine indicator. This consisted of a littlesteam-cylinder containing a nicely-fitting piston, whichmoved without noticeable friction through a range whichwas limited by the compression of a helical spring, by meansof which the piston was secured to the top of its distance through which the piston rose was propor-tional to the pressure exer
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
