Table 170 continued.-BULK OR STOWAGE CAPACITY PER TON OF VARIOUS SUBSTANCES. Barrels. To find the contents of a barrel in imperial gallons: first square the centre diameter in inches, and then multiply it by 2, to which add the square of the diameter of the end in inches; then multiply this by the length of the cask in inches, and divide by 1122. Table 172.-APPROXIMATE POWER REQUIRED TO DRIVE SELF-ACTING MACHINE-TOOLS WHEN CUTTING METAL AT AN AVERAGE Speed, with AN AVERAGE RATE OF TRAVERSE, OR FEED. Ditto ditto ditto 7 Face-lathe, turning 8 feet diameter Railway-wheel lathe, turning 5 feet diameter Planing machine to plane 6 ft. long and 2 ft. 6 in. wide. '77 115 1.67 2.50 Ditto ditto ditto 10 ditto 3 O ditto ditto 20 ditto 4 O ditto 1'07 1.60 24 Ditto ditto ditto Vertical drilling machine boring a hole 4 inches diameter Milling machine, with cutters 8 inches diameter Ditto ditto ditto 15 Screwing machine, screwing iron-bolts 1 inch diameter ditto I ditto Ditto ditto *75 *75 1'12 '20 *30 12 ditto ditto *38 *56 ⚫20 *30 *52 '77 12 1'12 1.16 2°45 2930 4:48 |