Every boy's book of railways and steamships (1911)
Protheroe, Ernest · London : Religious Tract Society · leaf 432
y to the value of about £4,000,000,in addition to vast quantities of dairy produce. At one time sheep were reared in Australia andNew Zealand for the sake of their wool alone,until refrigerating machinery was invented, bymeans of which meat could be kept for months ina perfectly sound condition.… … FAR EAST AND AUSTRALASIA 315 air at its ordinary temperature is compressed toabout one-third of its natural bulk, and then in-troduced into a chamber with walls that areimpervious to heat. The sudden expansion of theair to its natural bulk reduces it to about one-third of its former temperature,…
Railroads · Steamboats
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