. The romance of modern locomotion; containing interesting descriptions (in non-technical language) of the rise and development of the railroad systems in all parts of the world . lso remarkable from the fact that itdiffered from previously constructed liners in thesubstitution of a screw for the usual paddle-wheels asthe propelling power. The innovation at first causedsome alarm among the men who tended the engines,since the number of revolutions per minute, which forpaddles stood at 14 to 18, suddenly increased to 40 to90, and it was feared that the machinery must fly topieces under the stra
. The romance of modern locomotion; containing interesting descriptions (in non-technical language) of the rise and development of the railroad systems in all parts of the world . lso remarkable from the fact that itdiffered from previously constructed liners in thesubstitution of a screw for the usual paddle-wheels asthe propelling power. The innovation at first causedsome alarm among the men who tended the engines,since the number of revolutions per minute, which forpaddles stood at 14 to 18, suddenly increased to 40 to90, and it was feared that the machinery must fly topieces under the strain. People watched with interestthe performances of competing paddle and screwships. For some time victory lay with the former,but gradually the screw ousted its rival. In 1881 thefirst twin-screw vessel, the Netting Hill, that date few liners have been constructed tocarry but a single propeller. Iron is no longer used for shipbuilding. Steel hastaken its place, as being tougher and stiffer, weight forweight. But since even the stoutest metal cannotwithstand the effects of a collision, security against sinking is further secured through the division of a 362. The Kaiser Wilhelm II. (before the launch). The lari^est mail steamer in the world ; 706 ft. 6 in. long, and propelled by enginesgiving 40,000 liorse-power, and a speed of nearlj- 24 knots. [To face p. 362. Ocean Ferries vessel into a number of departments by a system ofbulkheads. When the exterior walls of such acompartment have been breached a danger signalis given, and in a few seconds the doors in the bulk-heads are closed, shutting off each compartment fromits neighbours, so that, even if one or more are filled,the vessel will still have sufficient buoyancy to enableher to progress without risk. Speed.—As in the case of the railway, the increaseof speed is one standard by which the progress ofocean travel must be judged. Disregarding theearliest experiments, we will commence comparisonsin 1840, when t
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