Hackworth's "Sanspareil", 1829.
The Sanspareil was a four-wheeled coupled engine, and with water in the boiler weighed 4 tons 15_ cwt., thus exceeding by 5_ cwt. the weight allowed by the terms of the competition, to be placed upon four wheels. The tender when charged with coke and water weighed 3 tons, 6 cwt., 3 grs. The boiler was cylindrical, 4' 2" dia. and 6 ft. long and was twice traversed, longitudinally by a return flue, one length of which, enclosing the fire grate, was 24" dia., while the other, terminating in the chimney, was 15". Both flues were prolonged 3 ft. beyond one end of the boiler, a suitable water space being made around this part of the flues. The chimney was 15" dia., the fire grate was 5 ft. long, thus presenting 10 sqr. ft. of area; that part of the flue answering to an ordinary firebox was 15.7 sq. ft. in extent; while the remaining part of the flue measured 74.6 sq. ft. The cylinders were vertical and were 7" dia. by 18" stroke. The connecting rods worked upon crank pins, in one pair of wheels with which the others were coupled by rods, all the wheels being 4 ft. 6 in. in diameter. The exhaust stream from the cylinders was sent through pipes into a single contracted nozzle or blast pipe turned upward in the centre of the chimney.