| Under | 120 | horse-power, | 101⁄2 | lbs. | per horse-power. |
| 160 | „ | 91⁄2 | „ | „ | |
| 200 | „ | 81⁄2 | „ | „ | |
| 240 | „ | 8 | „ | „ |
Or more than four times what is consumed to-day in moderately economical ships. In other words, to steam at her present rate across the Atlantic the City of New York, of 18,000 horse-power, would need to start with something like 7,500 tons of coal on board were her consumption per indicated horse-power equal to that of the best sea practice of that date, which could hardly have been under 6 pounds per indicated horse-power per hour.
This may be said to have been the status of affairs when, in 1836, under the influence of Brunei’s bold genius, the Great Western Steamship Company was founded as an off-shoot of the Great Western Railway, whose terminus was then Bristol. Brunel wished to know why the line should not extend itself to New York, and the result of his suggestion was the formation of the steamship company and the laying down at Bristol of their first ship, the Great Western.
Brunel’s large ideas were shown in this ship, though in comparatively a less degree, as well as in his later ones. She was of unprecedented size, determined on by Brunel as being necessary for the requisite power and coal-carrying capacity. The following were her principal dimensions: Length over all, 236 ft.; length between perpendiculars, 212 ft.; length of keel, 205 ft.; breadth, 35 ft. 4 in.; depth of hold, 23 ft. 2 in.; draught of water, 16 ft. 8 in.; length of engine-room, 72 ft.; tonnage by measurement, 1,340 tons; displacement at load-draught, 2,300 tons.
The Great Western, from an old painting.
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Dimensions of engines: Diameter of cylinders, 731⁄2 in.; length of stroke, 7 ft.; weight of engines, wheels, etc., 310 tons; number of boilers, 4; weight of boilers, 90 tons; weight of water in boilers, 80 tons; diameter of wheel, 28 ft. 9 in.; width of floats, 10 ft.
Her engines (side-lever) were built by the great firm of Maudslay & Field, who had been for some time one of the most notable marine-engine building firms of the period in Great Britain. They had, up to 1836, built 66 engines for steamers; the first being in 1815, when they built those of the Richmond, of 17 horse-power. The indicated power of the Great Western was 750; and a notable measure of the stride which steam has taken in the half-century since they undertook this contract is that they have since constructed twin-screw engines from which they have guaranteed to produce 19,500 horse-power. These drive a great armor-clad, which has six times the displacement of the Great Western and twice her ordinary speed.