. Farm implements, and the principles of their construction and use; an elementary and familiar treatise on mechanics, and on natural philosophy generally, as applied to the ordinary practices of agriculture ... onds, &c. Thus wesee that, in order to produce a two-fold velocity, a four-fold height is necessary, &c. So also in the escape ofwater under a head: to double the velocity of thestream, the head must be four times as high; to tripleit, the head must be nine times as high, &c. DISCHARGE OF WATER THROUGH ORIFICES AND PIPES. The discharge of water from a vessel is greatly in-fluenced by t
. Farm implements, and the principles of their construction and use; an elementary and familiar treatise on mechanics, and on natural philosophy generally, as applied to the ordinary practices of agriculture ... onds, &c. Thus wesee that, in order to produce a two-fold velocity, a four-fold height is necessary, &c. So also in the escape ofwater under a head: to double the velocity of thestream, the head must be four times as high; to tripleit, the head must be nine times as high, &c. DISCHARGE OF WATER THROUGH ORIFICES AND PIPES. The discharge of water from a vessel is greatly in-fluenced by the nature of the orifice through which itflows. If, for example, a vessel or cistern have a thinbottom of tin, with a smooth circular hole, we mightnaturally suppose that the discharge would be as easyas it could be made, and that water would pass as rap-idly through it as through any orifice of an equal this is not the fact. As the particles approachthis orifice, their motion throws them across, and theypartly obstruct the opening; it will be seen that theyconverge toward a point just under the orifice, where DISCHARGE OF WATER THROUGH ORIFICES AND PIPES. 191 Fig. 158. .^ijliiliilil. the stream will be considerably con-tracted (Fig: 158). If a short tube beinserted into the hole (the head beingthe same), this crossing of particles willbe partly prevented, and the liquid willflow more rapidly. The greatest ef- Fig. 159. Fig. 160.
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Keywords: ., bookcentury1800, bookdecade1850, bookpublishernewyo, bookyear1854
