. St. Louis courier of medicine. arged would berepresented by the formula g A, since each particle has onthe average a velocity equal to j/2 g A, and particles issue fromeach point in the area in the orifice. But this is by no meanstrue. In the following figure let A B represent the opening in thebottom of the vessel. Every particle above A B endeavors topass out of the vessel, and in doing so exerts a pressure on thosenear it. Those that issue near A and B exert pressure in the 488 Original Articles. [Dec, 1887. directions M M and N N, those near the centre of the orificein direction R. O., t
. St. Louis courier of medicine. arged would berepresented by the formula g A, since each particle has onthe average a velocity equal to j/2 g A, and particles issue fromeach point in the area in the orifice. But this is by no meanstrue. In the following figure let A B represent the opening in thebottom of the vessel. Every particle above A B endeavors topass out of the vessel, and in doing so exerts a pressure on thosenear it. Those that issue near A and B exert pressure in the 488 Original Articles. [Dec, 1887. directions M M and N N, those near the centre of the orificein direction R. O., those in the intermediate parts in directionsP O and P O. In consequence the water within the space POPis unable to escape and that which does escape, instead ofassuming a cylindrical form, at first contracts, and takes theform of a truncated cone. It is found that the escaping jetcontinues to contract, until at a distance from the orifice aboutequal to the diameter of the orifice. This part of the jet is calledthe mna Fig. 4. It is found that the area of its smallest section is about that of the orifice. The true value of the efflux per second istherefore about a y 2 g h. or about 0-62 of the theoreticalamount. This result is in the case of an orifice of a thin a cylindrical or conical efflux tube or ajutage is fitted to theaperture, the amount of the efflux is materially increased, andin some cases falls but little short of the theoretical short cylindrical ajutage whose length is two to three timesits diameter has been found to increase the efflux per second toabout, a -j/ 2 g h. In this case the water on entering theajutage forms a contracted vein (see fig. 5) just as it would do onentering the air, but afterwards expands, and, in consequence of HULBERT.] Divuleion of the Cervix. 489 the adhesion of the liquid to the tube has on leaving the ajutagea section greater than that of the contracted vein. The con-traction of the jet wit
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Keywords: ., bookcentury1800, bookdecade188, booksubjectmedicine, bookyear1887
