No. I. Locomotion. This engine was constructed by Messrs. Robert Stephenson and Co., Of Newcastle. It is mounted on six solid cast-iron wheels, with case-hardened tires; each wheel represents a disc with several circular perforations formed at equal distances from each other and also fron) the centre of the wheel. The six wheels weigh together about 54 cwt. ; and each three are connected by two coupling bars, each of which is attached to the two contiguous wheels. The cylinder is half inside and half outside the boiler, and placed vertically, being of 10 inches diameter, with a 24-iuch stroke. A fire-tube of 24 inches diameter passes from the furnace to the end of the boiler, and back again to the chimney, which is at the same end as the furnace, and is therefore called a return-tube.
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