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Updated: May 29, 2025
The Nile steamer, with engines of 110 nominal horses power each, and with two boilers having two independent flues in each, of such dimensions as to make each flue equivalent to 55 nominal horses power, works at 62 per cent. above the nominal power, so that the actual evaporative efficacy of each flue would be equivalent to 89 actual horses power, supposing the engines to operate without expansion; but as the mean pressure in the cylinder is somewhat less than the initial pressure, the evaporative efficacy of each flue may be reckoned equivalent to 80 actual horses power.
There is an Irish folk-saying that any dream may be remembered if the dreamer, after awakening, forbear to scratch his head in the effort to recall it. But should he forget this precaution, never can the dream be brought back to memory: as well try to re-form the curlings of a smoke- wreath blown away. Nine hundred and ninety-nine of a thousand dreams are indeed hopelessly evaporative.
The atmospheric resistance is at the rate of 12 lbs. a ton, with a load of 110 tons, equal to 1,320 lbs., moving at a speed of 30 miles an hour, which, when reduced, becomes 105.8 horses power, and this, added to 97.3, makes 203.1, instead of 200 horses power, as ascertained by a reference to the evaporative power of the boiler.
It is a very confusing practice, however, to speak of nominal horse power in connection with boilers, since that is a quantity quite indeterminate. Q. The main thing after all in boilers is their evaporative powers?
In locomotive engines the waste steam is always discharged into the chimney through a vertical pipe, and by its rapid passage it greatly increases the intensity of the draught in the chimney, whereby a smaller fire grate suffices for the combustion of the fuel, and the evaporative power of the boiler is much increased. Q. Can you give an example of a good locomotive engine of the usual form?
The briquettes were broken up to convenient sizes before being put in the bunkers. This fuel is not of so high evaporative efficiency as Nixon's navigation coal, but it is more suitable for torpedo boat work, because it gives out Very little dust, while the coal in closed stokeholes half smothers the firemen. Watering only partially mitigates the evil.
With this evaporative power there is a calorimeter of 990 square inches, or 12.3 square inches per actual horse power; whereas in Stephenson's locomotive with 150 tubes, if the evaporative power be taken at 200 cubic feet of water in the hour, which is a large supposition, the engine will be equal to 200 actual horses power.
Coke is equal or somewhat superior to the best coal in evaporative effect. Q. How much water will a pound of coal raise into steam in ordinary boilers? A. From 6 to 8 lbs. of water in the generality of land boilers of medium quality, the difference depending on the kind of boiler, the kind of coal, and other circumstances. Mr.
Then, too, the evaporative power of these same leaves is simply enormous, and generally undreamed of. Who would think that a great, spreading elm, reaching into the air of August a hundred feet, and shading a circle of nearly as great diameter, was daily cooling the atmosphere with tons of water, silently drawn from the bosom of Mother Earth!
Q. Can you state the evaporative efficacy of a pound of coal? A. The evaporative efficacy of a pound of carbon has been found experimentally to be equivalent to that necessary to raise 14,000 lbs. of water through 1 degree, or 14 lbs. of water through 1000 degrees, supposing the whole heat generated to be absorbed by the water.
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