+------+--------+-------+------+--------+----------+ | H. | P. | p. | H. | P. | p. | +------+--------+-------+------+--------+----------+ | 1 | 62·4 | ·4333 | 9 | 561·6 | 3·9 | | 1·25 | 78 | ·5416 | 10 | 624 | 4·3333 | | 1·5 | 93·6 | ·65 | 20 | 1248 | 8·6666 | | 1·75 | 109·2 | ·7538 | 30 | 1872 | 13 | | 2 | 124·8 | ·8666 | 40 | 2496 | 17·3333 | | 3 | 187·2 |1·3 | 50 | 3120 | 21·6666 | | 4 | 249·6 |1·7333 | 60 | 3744 | 26 | | 5 | 312 |2·1666 | 70 | 4368 | 30·3333 | | 6 | 374·4 |2·6 | 80 | 4992 | 34·6666 | | 7 | 436·8 |3·0333 | 90 | 5616 | 39 | | 8 | 499·2 |3·4666 | | | | +------+--------+-------+------+--------+----------+ TO FIND THE CONTENTS OF A TANK. To find the number of gallons contained in a tank, multiply the length, width, and depth together, in feet. This gives the contents in cubic feet; multiply by 6·24, and the result is the number of gallons contained. If the dimensions are in inches, use ·003607 in place of 6·24. SIZES AND WEIGHT OF CORRUGATED GALVANISED IRON SHEETS. +-----------+----------------+--------------+-------------+ | Thickness | | Weight | | | B.W.G. | Size of Sheets | Per Square | Square Foot | | | | Foot. | per Ton. | +-----------+----------------+--------------+-------------+ | | Feet. | lb. oz. | | | 16 | 6 × 2 to 8 × 3 | 2 1 | 800 | | 17 × 18 | 6 × 2 ” 8 × 3 | 2 4 | 1050 | | 19 × 20 | 6 × 2 ” 8 × 3 | 1 12 | 1300 | | 21 × 22 | 6 × 2 ” 7 × 2½| 1 7 | 1600 | | 23 × 24 | 6 × 2 ” 7 × 2½| 1 3 | 1900 | | 25 × 26 | 6 × 2 ” 7 × 2½| 1 0 | 2250 | +-----------+----------------+--------------+-------------+ THICKNESS AND WEIGHT OF GALVANISED SHEET IRON. Size of sheet, 2 feet in width by from 6 to 9 feet in length.