Australian deposits were worked in 1872, and in the following year the production was 3000 tons; the maximum outputs were in 1881-1883, averaging 10,000 tons annually; but the supply declined to 2420 tons in 1898 and has since increased to about 5028 tons in 1905.
The gas obtained by the Young process, when tested by itself in the burners most suited for its combustion, gives on the photometer an illuminating value averaging from 50 to 60 candle-power, but it is claimed, and quite correctly, that the enriching power of the gas is considerably greater.
In thickness and averaging when complete about 50 ft.
The majority of the Tonga Islands, however, are level, averaging 40 ft.
The general structure of the trans-Himalayan chains appears to indicate that the main axis of upheaval of the whole vast mass of the Tibetan highlands is to be found on two approximately parallel lines, represented the one by the Kuen-lun and the other by a line which is more or less coincident with the watershed between India and the central lake region, extending from Lake Pangong to Tengri Nor, the plateau enclosed between the two being wrinkled by minor folds, of which the relative elevation is comparatively low, averaging from woo to 1500 ft.
Streams are few and the rainfall is scanty, averaging only 16 in.
The commonest weight at Troy (44) is the shekel, averaging 224.
The sow is a prolific breeder and good mother, weighing, when mature but not fat, 450 lb - the boar averaging 600 lb, and barrows at six to eight months 350 lb.
Of 53 m., is separated from Jutland by a channel not half a mile wide in the north, but averaging io m.
Also struck a series of coins (32) averaging 199.