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We have been favoured by Mr. John Courbould, of Newcastle-upon-Tyne, with a tabulated statement of the results of some experiments recently made on the Newcastle and North Shields Railway, to ascertain the comparative consumption of coke and water by two locomotive engines, one called the Collingwood, built on the plan usually followed by Messrs. Stephenson and Co., and the other called the Exmouth, which is furnished with certain improvements, for which Messrs. R. & W. Hawthorn have lately taken out a patent. The tabulated statement we shall pass over, as it has already appeared in other journals; but we subjoin Mr. Courbould's general summary of the results obtained, with his explanation of the nature of the improvements in question. "These experiments show that the saving of fuel in the Exmouth, over that of the Collingwood, is 13.3 per cent, and of water 40.41 per cent. The improvements introduced in the Exmouth are, first - the fires are placed in the hinder part part of the engine, the same as in other engines, but the tubes which pass from the fires are broken off at the end, and return through the water again to the chimney, which is placed above the fire in the back part of the engine, thereby making use of the immense quantity of heat which in other engines escapes by the funnel after passing though the tubes. By this arrangement of the tubes the cinders which are great nuisance to railways, are completely done away with, for when having passed once through the sieves to the fire-box, the draught is not sufficient to carry them through again, they fall to the bottom of the smoke box. Another great improvement in the Exmouth is that the eccentrics are done away with, the motion being applied to the slide by the upward motion of the piston when passing over the crank. The fireboxes, too are arched, so that the stay beams and bolts are not longer necessary." - Railway Times.
Extract from the Port of Tyne Pilot 11 July 1840
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