International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 403
1017. When the upper surfaceof the Avater remains at the sameheight above the orifice, there is said to be a constanthead. The velocity of efflux varies for different pointsin the orifice; it is greater at the bottom of the orificethan at the top, since the head is greater at the bottom thanat the… … Fig. 181. h = v„ ^g Since the actual velocity is .98 of the theoretical /v V v velocity, the actual head is h= (-7^) -^^g— 1-04—. That is, the actual head must be 1.04 times the theoreticalhead due to the mean velocity. Let Q = theoretical number of cubic feet discharged persecond;v„^ = theoretical…
Railroad engineering
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