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Practical Utility of the Preceding Tables.

1. What will be the cost of 1 ton 2 cwts. 3qrs. 4 lbs. at 74d. per fb.

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And 2000 at 72d. (as per Table, p. 131) =£64 11 8

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2. In the Table of Equivalent Prices, the fifth column from the left hand is the price per single article, or 1; hence the other columns on the right and left of that give the price at an equal rate, according to the various denominations by which the columns are headed.

Thus, suppose the price per fb.=31d., the price per ton-£30. 6s. 8d. Again, suppose the price per gross =£1. 10s., the price per dozen=2s. 6d., &c.

STRENGTH OF MATERIALS.

Materials of construction are liable to four different kinds of strain; viz., stretching, crushing, transverse action, and torsion or twisting: the first of which depends upon the body's tenacity alone; the second, on its resistance to compression; the third, on its tenacity and compression combined; and the fourth, on that property by which it opposes any acting force tending to change from a straight line, to that of a spiral direction, the fibres of which the body is composed.

In bodies, the power of tenacity and resistance to

compression in the direction of their length, is as the cross section of their area multiplied by the results of experiments on similar bodies, as exhibited in the following Table.

Table showing the Tenacities, Resistances to Compression, and other Properties of the common Materials of Construction.

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