. The steam-engine and other heat-motors. hich com-bined with positive forces will produce positive moments. Forexample, the moment of the spring, z, is positive and the momentof the centrifugal force through OG is negative. Calling thestroke of the valve toward the shaft its instroke and the strokefrom the shaft its outstroke, we have: 1. The inertia of the reciprocating parts of the valve mech-anism is positive during the first half of the instroke and the SPEED VARIATIOX COXTROL. 393 second half of the outstroke. The inertia forces, therefore, produce;negative stress during the second half
. The steam-engine and other heat-motors. hich com-bined with positive forces will produce positive moments. Forexample, the moment of the spring, z, is positive and the momentof the centrifugal force through OG is negative. Calling thestroke of the valve toward the shaft its instroke and the strokefrom the shaft its outstroke, we have: 1. The inertia of the reciprocating parts of the valve mech-anism is positive during the first half of the instroke and the SPEED VARIATIOX COXTROL. 393 second half of the outstroke. The inertia forces, therefore, produce;negative stress during the second half of the instroke and duringthe first half of the outstroke. 2. When the steam pressure is on the outside of the valve(exhaust inside) the unbalanced pressure on the end of the valvestem will produce a negative stress in the eccentric rod. 3. Friction produces a positive stress on the instroke and anegative stress on the outstroke. 4. The weight of the reciprocating parts (in vertical engines)produces a negative stress during both
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