Number of
Days the
Retorts
were
worked.		Number
of
Retorts[20]
in
action.		Quantity of Coal
decomposed for
obtaining Gas.		Quantity of Coal
used for Fuel.		Quantity
of Gas
produced.		Proportion
of Gas to
a Chaldron
of Coals.
Chaldron. Bushel.Chaldron. Bushel.Cubic
Feet.		Cubic
Feet.
Monday87 16-18 3-22  165,00010,000
Tuesday88 14-24 3-24  146,66710,000
Wednesday88 14-24 3-24  146,66710,000
Thursday94 15-24 3-33  156,66610,000
Friday96 16-0 4- 0  160,00010,000
Saturday96 16-0 4- 0  160,00010,000
Sunday96 15-18 3-32  155,00010,000
107-026-271,070,00010,000[21]

[20] Worked at six hours charges in process A, [page 85], but here worked at eight hours charges.

[21] Average proportion of gas from a chaldron of coal.

Expenditure of process C.

Coal decomposed, 107 chaldron, at £ 2 11s. 6d. the chaldron£ 275106
Small coal, 26 chaldron, 27 bushels, used for fuel, at £ 2 2s. the chaldron5636
Total expenditure£ 331140

Products of process C.

Coke, 124 chaldrons, at £ 1 7s. the chaldron£ 16780
Breeze, or small coke, 4 chaldrons, at 18s. the chaldron3120
Tar, 8 tons, at £. 6 the ton4800
Ammoniacal liquor, 1945 gallons, at 11⁄2d. the gallon12311⁄2
Gas, 1,070,000 cubic feet, at 15s.
for a thousand cubic feet		802100
Total for products£ 10331311⁄2

RECAPITULATION.

Products by process C.£ 10331311⁄2
Products by process A.846106
Difference£  187271⁄2
Expenditure by process A.£  360170
Expenditure by process C.331140
Difference£.  2930

From the above recapitulation it will appear, that by working equal numbers of retorts, at six and at eight hours charges, the balance is considerably in favour of the latter method; for, from the foregoing statement, there appears to be on the practice of the latter method an increase of saleable products amounting to