The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

CLEVELAND, OHIO, THURSDAY, APRIL 21, 1892. No. 17. Progress in Marine Engineering. The four illustrations on this page from "Ocean Steam- ships," an article appearing recently in Scribner's, present a graphic history of the ad- vance in marine engineer- ing during the past eighty -years. 'The peculiar look- ing apparatus represents the engine of the Comet, the first steamboat con- structed and used for ser- viceable purposes in Great Britain. 'This steamer was built by Henry Bell on the Clyde in 1812, was 40 feet long, 10 feet broad and measured 24 tons. Her engines were of 4 nomi- nal horse power and they drove the boat 5 miles an hour between Glasgow and ing Company, Hull. PIONEER OF OCKAN GREYHOUNDS. (Copyright. by. Charles Scribner's Sons.) MODERN ENGINES OF A WAR VESSEL. (Copyright by Charles Scribner's Sons.) Greenock. 'The passenger service between these cities now includes the Duchess™ of Hamilton, 250 feet long, 30 feet beam, and 1o feet deep, and having engines 34% and 60 inches diame- ter with 60 inches stroke which drive the boat 18 knots an hour. But the comparison of the engin- eering department should be made with the 9,000 horse power twin-screw engines of the cruiser for th kel among the engravings. They were built by the Earle Shipbuild- e British navy, which are also shown MODERN CRUISER. (Copyright by Charles Seribner's Sons.) vesselsofiron having screw propellers previous to the Great Britain were at least six times as small. In 1836 a Swede This is the class of engine that gives a horse power for every 2 hundredweight of machinery, and when forced draft is employed as low as 1.6 hundredweight give a horse power, while the coal consumption averages only 1% pounds per horse power. The six-masted steam- ship, also shown in the drawings, was the Great Britain, the pioneer. of ocean greyhounds. She was built in 1839, for the Great Western Company, a corporation formed by Mr. Samuel Cunard, who went to England from Halifax, N.S. The Great Britain embodied two novel- ENGINES OF FIRST BRITISH STEAMBOAT. (Copyright by Charles Scribner's Sons.) ties for a large ship--an iron hull and a screw pro- peller. The credit of in- troducing iron hulls belongs to John Laird of Birken- head, who in 1829 built a -60-foot lighter and in 1833 an iron paddle wheel steamer 133 feet long. The first iron boat in American waters was built by Laird for G. B. Lamar of Savan- nah and was called the John Randolph. The only