[ 6i 3- 
IX. Short and eafy Methods for finding- 
(i.) "The §^a?2tity of "Time contained in ary 
given Number of Mean Lu?iations ; (2.) 
T*he Number of Mean Lunations contained in' 
any given §fuantity of Litne ; (3.) Lhe 
Niwiber of Iroy Fou?ids contamed in any 
give?! Number of Avoirdupoife Pounds^ and 
vice verfa ; (4.) Lhe Quantity and Weight 
of Water contamed^ in a full Pipe of any 
given Height y and Diameter of Bore ; and 
coifequently^ to find what Degree of Power 
would be required to work a common Pump^ 
or any other Hydraulic Engine^ when the 
Diameter of the Pump-bore^ and the Height 
to which the Water is to be raifed therein^ . 
are given. Communicated by Mr, James 
. Fergufon, F, R, S. 
Read Feb. 7> O O M E time ago, jufl: as I was finifli- 
^ table for (hewing the quantity 
of time contained in any given number of mean lu- 
nations within the compafs of 6000 Julian years, in- 
tending tliereby to examine how near our prefent 
aftronomical tables would (hew the times of fome 
antient eclipfes which we have on record, when the 
proper equ ations of the folar and lunar motions were 
I ‘ taken 
