[ 6a ] 



Inches. 

 Internal diameter of the pump or tube lo 



X lo 



S loo or fquare of the diameter; 

 Which multiplied by .785410 bring the contents of the fquare 

 -^^— — to the contents of the circle. 

 Which multiplied by the length of 1 78.5400 Contents of the area of the circle, 

 the ftroke ..... ^ 24 inches, produces i884cubic inches. 



3141600 

 1570800 



Which divided by 231)1884.9600(8. i6oogallons,whichis~4thsmore 



Viz. the number of cubic inches — — than 8 gallons at a ftroke, 



in a wine gallon, quotes 8 galls. 369 allow thefe decimals for 



— wafteof airineachftroke, 



1 386 and 60 llrokes to be made 



— ^ in a minute. 



Then . - - - - 8 gallons difcharged at a ftroke 

 Multiplied by 60 the num.ber of ftrokes 



Amounts to 48« gallons per minute ; 

 Which multiplied by 60 the minutes in an hour, produces 28800 gallons 



■ [in that time. 



And that divided by 252)28800(114.3 tons. 



(the number of — — 



gallons in a . 360 



ton, both wine ' 



and (hip mea- 1080 



fure) quo es 114 ■■■ 



tons in an hour. • . 700 



Then fuppofe the area of the hold of a fiiip to 

 be=i2o tons, and when freighted the interftices 

 between the grains, together with the area between 

 the furface of the corn and the underfide of the 

 deck=5 tons=to the quantity of mephitick air con- 

 fined; fuch being the lighteft fluid, the major part 

 of it would, foon after the commencement of the 

 operation, be forced by the atmofpherick air to vent 

 ilfelf at the holes provided for that purpofe; and the 



remainder 



