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Hilliard gave a laugh, then threw himself back into the corner, and did not speak again until the train pulled up at New Street station. An hour later he was at Old Square, waiting for the tram to Aston. Huge steam-driven vehicles came and went, whirling about the open space with monitory bell-clang.
Then again private enterprise asserted itself, but only to suffer precisely the same fate. Steam-driven omnibuses plied between Paddington and Westminster. Steam-driven stage-coaches plied on the Bath road.
As already suggested, the necessity for armor arose from the smashing and splintering effect of shell against wooden targets and the penetrating power of rifled guns. To attack Russian forts in the Crimea, the French navy in 1855 built three steam-driven floating batteries, the Tonnant, Lave, and Dévastation, each protected by 4.3-inch plates and mounting 8 56-lb. guns.
In the distance a deep sound that had been audible for some moments identified itself by a plaintive mooing like that of a gigantic cow and by the pearly spot of a headlight apparent half a mile away. It was a steam-driven train this time, rumbling and groaning, and as it tumbled by with a monstrous complaint it sent a shower of sparks and cinders over the platform. "Not one jot!"
The steamship, the hydraulic lift, the patent road-maker, the railway-train, the electric tram-car, the steam-driven mill, the Maxim gun and the torpedo boat, once made, may perform their labours with the guidance and assistance of comparatively few hands; but a whole army of men of science, engineers, clerks, and highly-trained workmen is necessary for their invention, construction, and maintenance.
For special purposes it is best to substitute a spherical for an ordinary circular tank and the size may be greatly diminished by using mercury instead of water. The sphere is complete, excepting for a small aperture at the top for the admission of the steel shaft of the steam-driven turbine.
The mettle of those California-bred horses was wonderful; the quick beating of their hoofs upon the graveled road was as regular as the motion of machinery, steam-driven.
Before the day of large, expensive steam-driven machinery, manufacture was done in scattered houses by workers who were the owners of their simple tools, and often of the material on which they worked; or in small workshops, where a master worked with a few journeymen and apprentices. Machinery changed all this.
The little Arrow is a screw-driven vessel, and her reciprocating engines that is, engines operated by the pulling and pushing power of the steam-driven pistons in cylinders developed the power of 4,000 horses, equal to 32,000 men, when making her record-breaking run.
Any account of Edison's work on the dynamo would be incomplete did it omit to relate his conception and construction of the great direct-connected steam-driven generator that was the prototype of the colossal units which are used throughout the world to-day.
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