Appleton's dictionary of machines, mechanics, engine-work, and engineering . fwater is allowed to fall, drawing in theair as it descends through openings thatare indicated by broken lines in the sidesof the column, and breaking upon an altarbelow. The air thus earned into the cis-tern has no means of escape except thetuyere t, and its quantity and pressuredelivered through that depends upon theabsolute size of the column of water, andthe proportions of the various parts. Ven-turi has already satisfactorily investigatedthe relations of this machine; which willnot be dwelt on in that aspect furt
Appleton's dictionary of machines, mechanics, engine-work, and engineering . fwater is allowed to fall, drawing in theair as it descends through openings thatare indicated by broken lines in the sidesof the column, and breaking upon an altarbelow. The air thus earned into the cis-tern has no means of escape except thetuyere t, and its quantity and pressuredelivered through that depends upon theabsolute size of the column of water, andthe proportions of the various parts. Ven-turi has already satisfactorily investigatedthe relations of this machine; which willnot be dwelt on in that aspect furtherhere than to say, that although very cheapand convenient in its construction, it usesmore water for a given effect than a?water-wheel would do, and that its effec-tiveness is quite limited. Karsten refusesto admit that the dampness of the blastit affords, injures the quality of the iron ;although it is probable that most metallurgists would conclude, in the face of general theory and exporience, that the good quality of iron made by this method exists in spite of IRON. 99 2367. The chain-blower of Henschel is an improvement upon this machine. In it, a more complete separ-ation of the air and water is effected, by means of an endless chain of floats or pistons, worked by thedescending water itself; but its effect is not such as to take it out of the general category of objections. The hydraulic bellows of Baader is, in fact, but a single-acting piston air-pump, in which the surfaceof a reservoir of water is made to take the place of the otherwise solid end of the pump. It cannot bemade to furnish blast either of large volume or much density, and is mentioned here only because it isactually used with satisfactory effect in suitable cases ; but it can only be recommended in districtswhere water is plenty and the labor of the artisan dear. The oscillating cylinders of DAubuisson are an extremely ingenious blowing-machine, cheap to con-struct, and worked with little power an
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