OF RAIL-ROADS.

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round, or to pass over a grooved wheel, turnedby the engine, of such a form that the wheelcould not turn round without causing the chainto pass along Avith it. When this wheel wasturned round by the engine, as the chain wasfastened firmly at the end, it could not be drawnforwards by the wheel, the carriage was there-fore moved forward in the line of the chain.

The carriages containing the goods wereattached to the Cngine-carriage, and thus con-veyed along the Rail-road.

At intervals of every eight or ten yards, thechain was secured by means of upright forks,into which it fell when left at liberty ; this wasfor the purpose of taking off the strain frompart of the chain, when more than one engineAvas travelling by it.

The chain was prevented slipping, when thegrooved wheel Avas turned round, by friction-rollers pressing it into the groove.

Mr. Chapman had one of his engines triedupon the Hetton Rail-road, near NeAvcastle,but it was soon abandoned ; the great friction,by the use of the chain, would operate con-siderably against it, and also its liability toget out of order.

In 1813, Mr. Brunton, of Butterley iron-Avorks, also obtained a patent for a mode ofaccomplishing the loco-motion of the engine

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