London Steam Carriage
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The London Steam Carriage was an early steam road vehicle constructed by Richard Trevithick in 1803 and the world's first self-powered passenger carrying vehicle. Cugnot had built a steam vehicle thirty years previously, but that had been a slow-moving artillery tractor not built to carry passengers.
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[edit] History
In 1801, after James Watt's earlier patent on "a carriage propelled by a steam engine" had expired, Richard Trevithick constructed an experimental steam-driven vehicle (Puffing Devil) at Camborne, Cornwall. It was equipped with a firebox enclosed within the boiler, with one vertical cylinder, the motion of the single piston being transmitted directly to the driving wheels by means of connecting rods. It was reported as weighing 1520 kg fully loaded, with a speed of 14.5 km/h (9 mph) on the flat. Trevithick ran this for several hundred yards up a hill with several people hanging on to it. Unfortunately, while the driver and passengers were in a pub celebrating the event, it set fire to the shed it had been left unattended in and was destroyed.
The following year, Trevithick and his partner, his cousin Andrew Vivian, patented a steam coach, the patent also describing other uses for Trevithick's new high pressure engines. The vehicle was assembled at Felton's carriage works at Leather Lane, London, the engine components having been brought from Falmouth where they were made.
[edit] Description
Not all the details of the Carriage are known but the drawings which accompanied the original patent have survived, as have contemporary drawings made by a naval engineer who was sent to examine it. Further information has also been obtained from eye witness accounts.
The Carriage had 8 ft diameter driving wheels which were intended to smooth out the road surfaces of the time so as to avoid the fire being extinguished through being shaken. A forked piston rod reduced the distance between the single cylinder and the crankshaft and was considered a particular innovation at the time. Spring operated valve gear was used to minimise the weight of the flywheel, overcoming one of the drawbacks of the industrial steam engines.
The engine had a single horizontal cylinder which along with the boiler and firebox was placed behind the rear axle. The motion of the piston was transmitted to a separate crankshaft via a forked piston rod which reduced the distance between the single cylinder and the crankshaft and was considered a particular innovation at the time. The crankshaft drove the axle of the driving wheel (which was fitted with a flywheel) via a spur gear. The steam cocks (used to blow out water that has condensed in the steam chest), the force pump and the firebox bellows were also driven by the crankshaft.[1]
It is interesting to note that the patent shows two features which may have been deliberately incorporated by Trevithick to discourage unlicensed copies: if the engine had been assembled as per the patent drawings it would only have run backwards and if the water pump had been arranged to be driven by the valve spring as shown, it would have run unevenly if at all.[2]
It is reported that the cost of building the coach (not including the engine) was £207 and that the cost of transporting the engine from Falmouth to London was £20 14s 11d. The cost of the engine is unknown.[2]
[edit] Operation
Following its completion, the London Steam Carriage was driven about 10 miles through the streets of London to Paddington and back via Islington with seven or eight passengers at a speed of 4 - 9 mph, the streets having been closed to other traffic.
On a subsequent evening, Trevithick and his colleague crashed the carriage into some house railings and as a result of this, lack of interest in the Carriage by potential purchasers, and its demonstrations having exhausted the inventors' financial resources,[3] it was eventually scrapped, the engine being used in a mill which made hoops for barrels.
[edit] Notes
- ^ Smiles, Samuel (1859). The Story of the Life of George Stephenson, Railway Engineer. John Murray, pp. 62 - 63.
- ^ a b Richard Trevithick 1803 London steam carriage. The Brooklands Society. Retrieved on 2008-01-24.
- ^ Jackman, William T. (1962). The Development of Transportation in Modern England. Routledge, p. 329. ISBN 0714613266.
[edit] References
- Fletcher, William (1891). The History and Development of Steam Locomotion on Common Roads. E. & F.N. Spon, p. 94.
[edit] External links
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