1. Two pairs of cast-iron rollers, 19 inches long, and 10 inches in diameter, fixed in a cast-iron frame, with brasses, wheels, shafts, bolts, scrapers, hoppers, shoes, &c.
2. Two pairs of edge-stones, 7 feet diameter each, with two bottom stones, 6 feet diameter each, cast-iron upright shafts, sweepers, wheels, shafts, chairs, brasses, bolts, and scrapers, with driving spur-wheels, &c.
3. Five steam kettles, with wheels, shafts, and brasses, bolts, breeches, and steam pipes, an upright cast-iron shaft, with chairs and brasses at each end; and a large bevel wheel upon the bottom end of upright shaft, and another, smaller, upon fly-wheel shaft, for the first motions.
4. Five stamper presses, with press plates of cast iron, cast-iron stamper shaft with 10 arms and 10 rollers, with bosses, brasses, bolts, driving bevel-wheels.
A well made oil-mill, consisting of the above specified parts, will manufacture 200 quarters of seed per week.
I have been assured by practical engineers, conversant in oil-mills, that a double hydraulic press, with 2 ten-inch rams, will do the work of no more than two of the stamper presses; that is to say, it will work 22 quarters in 24 hours; while three stamper presses will work 33 quarters in the same time, and produce one half more oil.
Castor oil, quantity of,
| Im- ported. | Retained for consumption. | Ex- ported. | |
|---|---|---|---|
| Year. | Cwts. | Cwts. | Cwts. |
| 1835. | 1,109,307 | 670,205 | 61,296 |
| 1836. | 981,585 | 809,559 | 68,515 |
Duty, from British possessions, 2s. 6d. per cwt.; from foreign, 1s. per lb.