The fame Quantity of Water will by the Experiment of 
our Author, furnifh a Jet £em of the diameter of a quarter 
of a London Inch, when the Refervatory is atthe height of 
1 1 French feet,or i j. /\ lo i Inch. Englijh\2sA the Expences 
of Fountains of the fame Bore, being as the Square Roots 
of the heights of the Refervatory, 4932 gall, or 78 Hogs- 
heads will furniQi a Je^ of 16 foot high, with a Quarter of 
an Inch Bore. Generally the;RuIe is, that the Expences of 
all Fountains, are as the Square Roots of the heights of their 
Relervatories, into the Squares of their Bores , and ac- 
cording to what is delivered in the y:h. Part of this Book, 
the Squares of the Diameters of the Pipes muft be proporti- 
oned thereto. 
IMPRIMATUR, 
JohnHoskyns FiteP. K. S. 
July i/thi^S^. 
Printed by J. Streater^ and are to be (bid by Sam. Smith 
at the Sign of the Frimesh Arms in St.P/w/'s Chmh-prd. 
