In 1874 triple-expansion engines had been designed for the Propontis by Mr. A. C. Kirk, of Napier & Sons, of Glasgow, which, on account of failure in the boilers which were used, did not give at first the results hoped for. In 1881 the Messrs. Napier fitted the Aberdeen with engines of the same kind, steam at 125 pounds pressure per square inch being used. In the next two years the change proceeded slowly, but by 1885 the engineering mind had so largely accepted it that a very large proportion of the engines built in that year were on this principle, and at the present it may be regarded as being fully accepted as was the compound engine ten years since. The saving in fuel is generally reckoned at from twenty to twenty-five per cent., or, to put it more graphically, in the words of Mr. Parker, Chief Engineer Surveyor of Lloyds, in his interesting paper, read in July, 1886, before the Institution of Naval Architects: “Two large passenger steamers, of over 4,500 gross tonnage, having engines of about 6,000 indicated horse-power, built of the same dimensions, from the same lines, with similar propellers, are exactly alike in every respect, except so far as their machinery is concerned. One vessel is fitted with triple-expansion engines, working at a pressure of 145 pounds per square inch; while the other vessel is fitted with ordinary compound engines, working at a pressure of 90 pounds per square inch. Both vessels are engaged in the same trade and steam at the same rate of speed, viz., 12 knots an hour. The latter vessel in a round voyage of 84 days burns 1,200 tons more coal than the former.” In the epoch 1879 to 1887 the following great ships had been placed upon the Liverpool and New York lines, their best speeds to that date being as shown: Days. Hours. Minutes. 1. Etruria 6 5 31 2. Umbria (sister ship) slightly longer 3. Oregon 6 10 35 4. America 6 13 44 5. City of Rome 6 18 0 6. Alaska 6 18 37 7. Servia 6 23 55 8. Aurania 7 1 1 The time had thus been shortened much more than half since 1840, and had been lessened forty per cent. since 1860.