. Applied thermodynamics for engineers. -N Fig. 156. Art. 347. —Diagrams for Hornsby-Akroyd Engine. 220 APPLIED THERMODYNAMICS this, variation of the clearance, by mechanical means or waterpockets and outside compression have been proposed, but no practicablyefficient means have yet been developed. The speed of an engine maybe changed by varying the point of ignition, a most wasteful method,because the reduction in power thus effected is unaccompanied by anychange whatever in fuel consumption. Equally wasteful is the us3 ofexcessively small ports for inlet or exhaust, causing an increased nega
. Applied thermodynamics for engineers. -N Fig. 156. Art. 347. —Diagrams for Hornsby-Akroyd Engine. 220 APPLIED THERMODYNAMICS this, variation of the clearance, by mechanical means or waterpockets and outside compression have been proposed, but no practicablyefficient means have yet been developed. The speed of an engine maybe changed by varying the point of ignition, a most wasteful method,because the reduction in power thus effected is unaccompanied by anychange whatever in fuel consumption. Equally wasteful is the us3 ofexcessively small ports for inlet or exhaust, causing an increased nega-tive loop area and a consequent reduction in power when the speedtends to increase. In engines where the combustion is gradual, as inthe Braj^ton or Diesel, the point of cut-off of the charge may be changed,giving the same sort of control as in a steam engine. Three methods of governing Otto cycle engines are in more or lesscommon use. In the hit-or-miss^^ plan, the engine omits drawing in itscharge as the external load decreases. O
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