25

THE GEOLOGY OF AUCKLAND. 21

Per-centage composition of Lignite, from Auckland.
Carbon ............................................ 55.57
Hydrogen ........................................ 4.13
Oxygen ............................................ 15.67
Nitrogen .......................................... 1.15
Sulphur ........................................... 0.36
Ash .................................................. 9.00
Water ............................................... 14.12
_____
100.00
______
Coke ............................................... 50.78 per cent

The amount of sulphur is small, and this will be a point for
favourable consideration in the application of the coal for
smelting purposes. The whole of the water is expelled at a
temperature of 120⁰ centigrade
__________________
Dundee Gas Works,
March 17, 1859.
Analysis of Auckland Coal.
Produce of gas per ton of coal carbonized, 9,632 cubic feet.
Illuminating power of gas, 1∙75.
Durability: the length of time that a 4-inch jet requires to
consume a cubic foot of gas, 53 minutes.
Specific gravity, 495.
Produce of coke per ton, carbonized, 9¼ cwt.
(Signed) JOHN Z. KAY,
Engineer Gas Company.
______________
Gas Works, Berwick,
March 12, 1859.
New Zealand Coal.
Gas, in cubic feet, per ton of coal, 7,617.
Coke, per ton of coal, in lbs., 1,155.
Tar and ammoniacal liquor, per ton of coal, in lbs., 571.
Value of gas, per ton of coal, in lbs. of sperm, 384.
One cubic foot of gas, burned in a No. 2 fishtail burner (or
nion set), equal sperm candles, 3∙12.
Value of one cubic foot of gas, in grains of sperm, 374∙40.
C2