Transactions of the American Society of Mechanical Engineers Volume 9

Transactions of the American Society of Mechanical Engineers Volume 9

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 edition. Excerpt: ...parties, that the fine mathematical reasoning involved is most in accord with Mr. Porter's mode of thinking: Schknectady, N. Y., January 9, 1888. My Dear Mr. Babcock: I fancy you gave Silber credit for something he never thought of, namely, an isochronous centrifugal governor. We must put ourselves back to the year 1855. A high-speed governor had not then been made; strong counteracting forces, enabling a governor to develop power to operate a valve on a minute change of velocity, were unknown. The influence of friction on a governor, and the means of avoiding it, had not been thought of. Added since the meeting. The governor shown in Scientific American, it is evident from the spring represented, was a feeble one, revolving at the ordinary slow speed. A variation of from 10 per cent, to 15 per cent, in the speed of the engine was undoubtedly tequired to cause the governor to move through its range of action. On less than this it would Dot operate the large throttle valve without oscillntion. As then commonly constructed, governors required this amount of variation, and often more than this. That amount of variation would not be observed at all on those paddle-wheel engines. The adjustment applied to the spring enabled the sensibility of the governor to be increased, but this could only have been done in a slight degree. Too much sensibility meant loss of stability and oscillation. When we talk about sensibility of governors nowadays, we mean something nobody at that time dreamed of. The fact that Silber very soon abandoned that form of governor shows that he had no idea of its possibilities, which high speed was afterward to reveal. On full reflection, I think my claim to have first stated the principle of isochronism in governors more

Product details

  • Paperback
  • 189 x 246 x 13mm | 431g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236568818
  • 9781236568816