438
Molesworth’s pocket-book
Cokn Mills.
For each pair of stones with, all the necessary
dressing machinery, &c., it is usual to allow four
horse-power nominal.
One pair of 4-feet stones will grind about five
bushels of wheat per hour. Each bushel of wheat so
ground per hour, requires 1'11 horse-power (indi-
cated) exclusive of dressing and other machinery.
SPEED IN CORN MILLS.
Stones 4 ft, diameter, 140 revolutions per minute.
Dressing machines, 450 to 500 revolutions per
minute, 21 inches diameter.
Creepers, 75 revolutions per minute, with 3j
pitch.
Elevator, 40 revolutions per minute, with 18
inches diameter.
Wheat screen, 300 to 350 revolutions per minute,
18 inches diameter.
PROPORTIONS OF COOKS.
B = The bore of the cock.
Bottom diameter of plug = B x 1J.
Length of plug 4 B x 3.
Length of handle = B x 6.
Taper of plug | inch to each inch of length.
SPEEDS FOR GRINDING AND POLISHING, &C.
Ft. per min,
large grindstones for polishing 2000
emery discs .. .. 2500 to 3000
polishing largo articles .. 750
tool grinders.................. 650
circular saws for hot iron .. 20,000
disintegrators ..............10,000
plate-bending rolls .... 4
millstones .................. 1700
eack tackle.................... 50