NOTE 2. The rule of practice is nearly superseded by the use of Federal Money.

EXAMPLE.

What is the value of 526 yards of cloth at 3s. lOjd. per yard?

5261.

Ans. at 11.

TARE AND TRETT.

Tare And Trett are practical rules for deducting certain allowances, which are made by merchants and tradesmen in selling their goods by weight.

Tare is an allowance, made to the buyer, for the weight of the bos, barrel, or bag, &c. which contains the goods bought, and is either at so much per box, &c. at so much per cwt. or at so much in the gross weight.

Trett is an allowance of 4lb. in every 104lb. for waste, dust, &c.

Cloff is an allowance of 2lb. upon every 3cwt.

Gross weight is the whole weight of any sort of goods, together with the box, barrel, or bag, &c. that contains them. Suttle is the weight, when part of the allowance is deducted from the gross.

Net weight is what remains after all allowances are made.

CASE I.

When the tare is a certain weight per box, barrel, or bag, &c.

RULE.*

Multiply the number of boxes, or barrels, &c. by the tare, and subtract the product from the gross, and the remainder is the net weight required.

EXAMPLES.

1. In 7 frails of raisins, each weighing 5cwt. 2qrs. 5lb. gross, tare 23lb. per frail, how much net?

23x7=lcwt. lqr. 21lb.

* It is manifest, that this, as well as every other case in this Nile, is only an application of the rules of proportion and practice

2. In 241 barrels of figs, each 3qrs. 19lb. gross, tare lOlb. per barrel, how many pounds net?

Ans. 22413. 3. What is the net weight of 14 hogsheads of tobacco, each 5cwt. 2qrs. 17lb. gross, tare 1001b. per hhd.?

CASE II.

25

Ans. 66cwt. 2qrs. 141b.

When the tare is a certain weight per cwt.

RULE.

Divide the gross weight by the aliquot parts of a cwt. contained in the tare, and subtract the quotient from the gross, and the remainder is the net weight.

EXAMPLES.

1. Gross 173cwt. 3qrs. lTlb. tare 16lb. per cwt. how much net?

2. What is the net weight of 7 barrels of pot-ash, each weighing 2011b. gross^ tare being at 10lb. per cwt. ?

Ans. 12811b. 6oz.

3. In 25 barrels of figs, each 2cwt. lqr. gross, tare 16lb. per cwt. how much net? Ans. 48cwt. 24lb.

P

CASE III.

When Trett is allowed with Tare.

RULE.

Divide the suttle weight by 26, and the quotient is the trett, which subtract from the suttle, and the remainder is the net weight.

EXAMPLES.

1. In 9cwt. 2qrs. 17lb. gross, tare 37lb. and trett as usual* how much net?

2. In 7 casks of prunes, each weighing 3cwt. lqr. 5lb* gross, tare l/£lb. per cwt. and trett as usual, how much net? Ans. 18cwt. 2qrs. 25lb.

3. What is the net weight of 3 hogsheads of sugar weighing as follows: the first, 4cwt. 5lb. gross, tare 73lb.; the second, 3cwt. 2qrs. gross, tare 56lb. and the third, 2cwt. Sqrs. 17lb. gross, tare 47lb. and allowing trett to each as usual? Ans. 8cwt. 2qrs. 4lb.

CASE IV.

When tare, trett, and cloff are all allowed.

RULE.

Deduct the tare and trett, as before, and divide the suttle by 168, and the quotient is the cloff, which subtract from the suttle, and the remainder is the net.

EXAMPLES.

1. What is the net weight of a hhd. of tobacco, weighing 15cwt. 3qrs. 20lb. gross, tare 7ib. per cwt. and trett and cloff as usual?

2. In 19 chests of sugar, each containing 13cwt. lqr. 17lb. gross, tare 13lb. per cwt. and trett and cloff as usual, how much net, and what is the value at 5~d. per pound?

Ans. 215cwt. lrlb. and value 5771. 6s. 5|d.

COMPOUND PROPORTION.

Compound Proportion teaches how to resolve such questions, as require two or more statings in Simple Proportion. In these questions there is always given an odd number of terms, as five, seven, or nine, &c. These are distinguished into terms of supposition, and terms of demand, the number of the former always exceeding that of the latter by one, which is of the same kind with the term or answer sought.

This rule is often named the Double Rule of Three, because its questions are sometimes performed by two opera^ tions of the Rule of Three.