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Take the former example:

in.

Bung diameter, 34} . , . - .

tt , i. f To find the weight of water

Head diameter, 27 > , . °

Length - - 50 i d,s P laCed '

34 — 27=7; the number corresponding to which

in the table, is 3-88.

27 + 3-88 = 30-88, diameter of cylinder.

2 Log. of 30-88 = 1-489677 X 2=2-979354.. ..50 1-698970

7-44491

gallons 132-8 2-123234

weight of a gall, of water 10.2 lbs.-

2656

1328

wt. of water displaced, 1354-56 lbs.

This rule gives 26 lbs. more than the former,and is certainly nearer the truth; for casks areall a little curved, however they may approxi-mate to the conical shape.

The following simple and exact rule is givenby Dr. Hutton in his Mensuration , chap. 7,page 451. Add into one sum, 39 times thesquare of the bung diameter, 25 times thesquare of the head diameter, and 26 timesfhe product of the two diameters; multi-

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