Hydraulics.

different Depths below thethe Momentum of Fluids, as

Surface: Forwell as solidBodies,

tiiy of Surface in such an Adjutage-Piece, w ic

greatly retard the Jet, and diminish the Heig -

is a Fault which most People have run into or

an experimental Knowledge of this Leienee.

iake of Beauty they screw on such a cornea .

presented at M, of an Inch in Length, in

Plate of Brass, whose Thickness need not exceed the

40th Part of an Inch for very large Jets, and whole

Friction will therefore be 40 Times less. Plate

11. If the Jet be play’d from G, the V elocity jvith Plate^

which it sets out from the Adjutage, will be as ^'Q~. Fig* 4 •and throw it to its full Height G C at once; but it. the Pipe descends below F G to HI, an t encturns upwards again to the same Level F ’ j 1 ' 1 . ,

Jet be play’d from K, the Velocity with winch rt sets. out from K at first will not be the some as theVelo

city from G, that is, it will not be as_ < ^_Jf/OH - F Hf but it will be as V Q_H V I H,which is less, and therefore the Height at first will beonly KL, from whence by Degrees it will rife to iVLupon the same Level with C, lo that its last eigKM will be equal to the Height G C of the Jet

from G. , ,

12. The Truth of the last Article is thus demon-strated. The Water in the Legs QH and I K are toFe consider’d as two Non-elastic Bodies, whole IV 0-menta (being as the Pressure) are as the Altitudes Q_and I K ; and since both the Velocities and Quantitiesof Matter moved in a given Time, are as the SquarRoots of the Altitude (as will be shewn in the nex t An-

notation) therefore we have QH — s/ QH X vQ.H,and IK = -yiK X /If, and since the Differenceof the Momenta, divided by the Sum of the Bodies,gives the Velocity after the Stroke ( AnnotationXXIII. Art. 4.) which we will call *, therefore