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the quotient equal the effect produced in horses'

power.

Ex. Required the power produced by 1400 cubic feet per minute over a fall of 30 feet.

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Plates G and H exhibit miniature views of a ponderous overshot water-wheel, chiefly of wrought iron, and in which novelty of construction, immense diameter, and great efficiency, have rendered it an object of universal interest throughout the district in which it is situated its nominal power is that of 30 horses, but upwards of 40 of indicated resistance seems not materially to diminish its velocity; and no doubt, on account of the improved form of the buckets, the greatest amount of the water's effect is obtained.

TABLE OF THE RADII OF WHEELS, FROM TEN TO THREE HUNDRED TEETH, THE PITCH* BEING TWO INCHES.

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BY B. DONKIN, ESQ., CIVIL ENGINEER, LONDON.

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10 3.236

11 3.549 21

3.864

16 5.126 17

5.442

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20

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6.710 31 9.885 41 7.027 32 10.202 42 4.179 23 7.344 33

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10.520 43

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4.494 24
4.810 25 7.979 35

7.661 34

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27

8.614 37

11.474 46 14.654 11.792 47 14.972 5.759 28 8.931 38 12.110 48 15.290 58 18.471 6.076 29 9.249 39 12.428 49 15.608 59 18.789

* By the pitch is understood the distance between the centres of two contiguous teeth; and by the radius is understood the distance between the centre of the wheel and the centre of each tooth. For any other pitch, say, as two inches is to the radius in the table, so is the given pitch to the radius required.

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PRICES OF MILL WORK, MACHINERY, AND LABOUR,

APPROXIMATELY VARYING,

WITH THE PRICES OF IRON AND OF LABOUR.

MILL,

Bean, from 31. 13s. 6d. to...

£ 8. d. each 616 6

Ditto

Ditto

Ditto

Ditto

Ditto

Ditto

Ditto

Bone, for crushing bones, to crush 3 tons per day do. 105 0

do. 125 0

4

ditto

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Brick, including the horse's wheel and every requisite

for making large quantities in little time, about, each1200 0 0 Bruising, for corn, malt, pulse, &c.

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Corn, Indian, with cast iron bed and runner, machinery,

&c., complete

each 180 00

Corn, 4-horse power, with stones 3 feet 2 inches diameter,

not including the horse wheel

each 140 0 0

Corn, including the horse wheel

Drug, with the machinery complete for ditto

Flour, the improved family mill, with French burr stones,

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Kibbling, with fly wheels, with or without frames,
from 20. 108. to...

each

Lead, with cast iron bed, 7 feet 9 inches long, and 3 feet
2 inches wide, rollers 5 feet long, and 12 inches diame-
ter, with square threaded screws, and the whole of
the machinery complete, except the power .... each 1000
Linseed, with two rollers 5 feet long, and 12 inches
diameter, fitted up with spur pinions, brasses, set
screws, cast iron frame, &c.

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MILL,

Saw, an upright saw mill, with frame and shifting do.,
guide rods, brasses, and guides, spindles, rollers,
ratchett wheel, rods, catch, &c., connecting rod,
brasses, set of saws, buckles, &c., for cutting deals,
not including the power, about
Saw, do., for planks, &c. ..

do. do. for cutting timber 2 feet deep, about..
do. do. 3 feet deep

£ s. d.

each 180 0 do. 230 0

do. 450 0 do. 570 0

Circular saw, with cast iron frame and bench, sliding
rule, bearings, rigger, extra carriage, clutch, and
lever, including a set of saws, do. do.

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each 100 0 0 do. 600 0

For cutting veneers, 12 feet diameter
For cross cutting, round or square timber, upon the
principle of the stone mill, framed, with three spur
wheels, &c.

do.

..

each 150 0 0 3 13 6

Steel, for wheat, barley, oats, peas, beans, &c. do.
do.
do.
do.
Sugar, cattle, for the West Indies, &c. The rollers in a
strong iron frame, 5 feet long, and 2 feet diameter, to
work in a horizontal position, including the machinery
to work the mill, with the wood arms, sweeps, &c.,
for the cattle to draw from, complete.
rollers, 4 feet long, and 2 feet diameter......

each 670
do. 610

6 16 6

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do. 560

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do. 525

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The machinery for connecting the engine to the mill, for working it, in addition

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A pair of wheels to connect the spindle of windmill
to the sugar mill, will be, in addition to the fore-

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do. 820 0

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The machinery to connect the shaft of the water wheel, will be, in addition to the above to each mill

...... each 180 0 0

The rollers in an iron frame, 3 feet long, and 2 feet diameter, to work in a vertical position.... each 460 0

0

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