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For use over a spirit or Swedish petroleum stove the first two types are most convenient; the third will work well on a stove or an open fire; and the last proves very efficient on an open fire. One may take it that, as a general rule, areas of heating surface being equal, the water-tube kettle will boil more quickly than the fire-tube. Fire-tube Kettles.
A system of hot steam-pipes had been rigged in the holds so that in the antarctic an equable temperature could be maintained. The great water tanks were forward immediately below the forecastle. The inspection of the engines came last. The Southern Cross had been fitted with new water-tube boilers two of them that steamed readily on small fuel consumption.
The steam-valve is a packed slide with but little lap, and the expansion-valve is an adjustable slide working on the back of the steam-valve. The boilers are of the vertical water-tube type, with the tubes above the furnaces, and are supplied with fresh water by tubular surface-condensers, which, together with the air-pumps, are placed opposite the cylinders.
The small water-tube is preferable to the small fire-tube connecting furnace and chimney, as its surface is exposed more directly to the flames; also it increases, instead of decreasing, the total volume of water in the boiler. A Vertical Boiler. The absence of a water jacket to the furnace is partly compensated by fitting six water-tubes in the bottom.
Most steam automobile boilers are of the water-tube variety that is, water to be turned into steam is carried through the flames in pipes, instead of the heat in pipes through the water, as in the ordinary flue boilers. Compactness, quick-heating, and strength are the characteristics of motor-car boilers.
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.
Ahoy there!" came the voice to Abel Keeling, a little more strongly, as if a shifting wind carried it, and speaking faster and faster as it went on. "Not wind, but steam; d'you hear? Steam, steam. Steam, in eight Yarrow water-tube boilers. S-t-e-a-m, steam. Got it? And we've twin-screw triple expansion engines, indicated horse-power four thousand, and we can do 430 revolutions per minute; savvy?
Recently, however, there is strong evidence that where steam is the power agent to be employed the water-tube type of boiler is likely to be employed, and to the exclusion of all other forms of apparatus for the generation of steam. The heaviest parts need not exceed 3 cwt. in weight, and require neither heavy nor yet expensive brickwork foundations.
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