EXAMPLE.

Let ABCD be a rectangular Cooler, to be gaged and

Extend a tape from C to A, and at e, half the distance, make a mark with chalk. In like manner make marks at f, g, and h, half way respectively between D and B, B and A, C and D. Then take the distance of e from ƒ, which let be 360 inches, the length of the Cooler. Again take the distance of g from h, which let be 200 inches, the breadth of the Cooler.

Fix, now, your constant dipping place, to which there can at all times be free and easy access, as at X, and cause liquor to be admitted into the Cooler, till the shallowest part of the bottom is covered at least an inch.

Lastly, take several dips, as at i, k, l, m, n, o, p, q, r, s, and t, of which let the following be a memorandum:

Number of dips 11 ) 26.7 sum

Quotient 2.4 MEAN DEPTH.

If the dip at X be now found to be 24 inches, there will be nothing additive or subtractive; but if the dip at X be 3 inches, it follows that the dipping place gives 6 tenths of an inch too much: or, if the dip at X be only 2 inches, then it is 4 tenths of an inch too little. Suppose it to be 2.9 inches, and the mark on the post or beam will be,

The area of the base in ale gallons, for an inch deep, will be the length of the Cooler multiplied by the breadth, and divided by 282, the number of cubic inches in an ale gallon: hence, for one tenth of an inch deep, it will either be 360 multiplied by 200, and divided by 2820; or it will be the product of the length by one-tenth the breadth, divided by 282, as follows:

360 length of the Cooler

Multiply by 20 one-tenth the breadth

A. G. divisor 282) 7200 (25.5 ale gallons.

Wherefore to tabulate the Cooler we have only to add this content, namely, 25.5 ale gallons, continually to itself as below:

A. B.'s COOLER, No. 1, TABLED.

To Gage and Tenth a Multilateral Cooler.

Divide the base into such figures as, on the princi

ples laid down in the Mensuration, can be most easily measured, and find the area for one tenth of an inch deep, as in the last Problem. Then make the necessary deductions for off-sets, that is, for pillars or other bodies occupying part of the area. Lastly, chuse a

dipping place, and proceed in all other respects as in

PROBLEM X.

EXAMPLE.

Let ABCDEFGH be a Cooler with off-sets, to be gaged and tenthed.

Prolong the line CD to k; and the line FG, to i: then take the necessary dimensions with a box and tape. The dimensions, in the instance before us, we shall suppose to be as follows: