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Updated: June 2, 2025
The trailing drivers are driven by a pair of outside cylinders, 18 in. diameter and 24 in. stroke; and the leading drivers by a single low-pressure cylinder which takes the exhaust steam from the high-pressure cylinders of 26 in. diameter and 24 in. stroke, placed under the center of the smoke-box.
'As general items of river history, we quote the following marginal notes from his general log 'In March, 1825, Gen. Lafayette left New Orleans for St. Louis on the low-pressure steamer "Natchez." 'In January, 1828, twenty-one steamers left the New Orleans wharf to celebrate the occasion of Gen. Jackson's visit to that city.
The water, moving gently with the pulse of the swell, broke the beam of light and objects it touched were distorted and magnified. The top of the big low-pressure cylinder looked gigantic, and the thick columns appeared to bend. Long weed clung to the platforms, from which iron ladders went down, but so far as Lister could distinguish, all below was buried in sand. He had seen enough.
As, in consequence of varying temperatures, there is an appreciable difference in the endwise expansion of the spindle and cylinder, the baffling rings in the low-pressure balance piston are so made as to allow for this difference. The high-pressure end of the spindle being held by the collar bearing, the difference in expansion manifests itself at the low-pressure end.
These have generally appeared in the Upper Missouri valley, from whence their movements have been south and eastward across the country. Their advance has been frequently marked by high northerly winds and gales, especially when preceded by decidedly low-pressure areas, in the more northern districts and on the Texas coast.
'As general items of river history, we quote the following marginal notes from his general log 'In March, 1825, Gen. Lafayette left New Orleans for St. Louis on the low-pressure steamer "Natchez." 'In January, 1828, twenty-one steamers left the New Orleans wharf to celebrate the occasion of Gen. Jackson's visit to that city.
"He told me that the first time he went into the engine-room of a steamer, when he was a boy, he prayed to the low-pressure cylinder." "Not half a bad thing to pray to, either. He's propitiating his own Gods now, and he wants to know what Mother Gunga will think of a bridge being run across her. Who's there?" A shadow darkened the doorway, and a telegram was put into Hitchcock's hand.
She derived this speed from six water-tube boilers, feeding at a pressure of three hundred pounds live steam to five turbine engines working three screws, one high-pressure turbine on the center shaft, and four low-pressure on the wing shafts. Besides these she possessed two "astern" turbines and two cruising turbines all four on the wing shafts.
The top just described must be light, as the steam driving it is low-pressure, having free egress from the boiler, and small, as the steam has comparatively low velocity. The possessor of a high-pressure boiler may be inclined to make something rather more ambitious larger, heavier, and useful for displaying spectrum discs, etc.
The wood-encased bulk of the low-pressure cylinder, frowning portly from above, emitted a faint wheeze at every thrust, and except for that low hiss the engines worked their steel limbs headlong or slow with a silent, determined smoothness.
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