Sor preferving Corn on Ship-board. 3907 
the fquare thus obtained, multiplied by .7854, wilk give the 
contents of the circle in cubic inches; which, multiplied 
again by twenty-four inches or lengths of the ftroke, being 
the proportion of the barrel filled with air, gives in cubic 
inches the amount of each difcharge on the defcent of the 
pifton. As thus: 
: Inches. 
Internal diameter of the pump or tube 10 
30 
= 100, or fquare of the diameter; 
which, multiplied by .7854, to bring the contents of the fquare 
to the contents of the circle. 
Which, multiplied by the 78,5400 Contents of the area of the circle. 
length of the firoke, i 24 inches, produces 1884 cubic 
inches. 
3141600 
15705800 
18849600 
which, divided by 231) 1884.9600(8-1600 gallons, which is gos ths 
vis. the number of cubic inches —— more than § gallons at a 
in a wine gallon, quotes 8 galls. 369 ftroke; allow thefe deci- 
pea mals for wafte of air in 
1336 eachftroke;and6oftrokes 
to be made ina ininutes 
Then - - --- --~ 8 gallons difcharged at a ftroke, 
multiplied by 60 the number of ftrokes 
amounts to 480 gallons per minute ; 
which multiplied by - - 60, the minutes in an hour, produces 28S09 
oS gallons in that time; 
and that, divided by 252)28800(114.3 tons. 
(the number of 
gallons in a 360 
ton, bath wine 
and fhip mea- 1080 
fure) quotes 114 ——— 
tons jn an hour, #720 
Then, fyppofe the area of the hold of a fhip to be = 320 
tons, and, when freighted, the interftices between the grains, 
together with the area between the furface of the corn and 
the 
