. The principles and practice of dental surgery. blow-pipe arealmost infinite. The principle of construction is either that ofthe bellows or the force-pump, combined with a reservoir of airto give uniformity to the blast, which would otherwise issue injets. A common house-bellows, secured to the floor, will form asimple and good arrangement. A spring should separate thehandles, the upper one of which forms the treadle. An india-rubber pipe should pass from the nozzle to an air-tight box, fromwhich a second tube comes out and is attached to the the bellows is made double, like a bl
. The principles and practice of dental surgery. blow-pipe arealmost infinite. The principle of construction is either that ofthe bellows or the force-pump, combined with a reservoir of airto give uniformity to the blast, which would otherwise issue injets. A common house-bellows, secured to the floor, will form asimple and good arrangement. A spring should separate thehandles, the upper one of which forms the treadle. An india-rubber pipe should pass from the nozzle to an air-tight box, fromwhich a second tube comes out and is attached to the the bellows is made double, like a blacksmiths, the upperhalf forms the air-ciuimber, in place of the air-tight box. In Fig. 216 is shown a double-cylinder bellows, ten inches indiameter, moved by a treadle attached to the rod {df) whichpasses under the soldering-table. In the drawing it is combinedwith an alcohol blow-pipe, as designed by Dr. W. H. Elliot, ofMontreal; but it may be used independently by attaching aflexible tube, with brass point, to the air-pipe {a a). The fol- \. SOLDERING. 675 lowing excellent remarks by Dr. Elliot, upon this combination,will be found very instructive: The fact, that the centre of the flame of the self-acting Fig. 216.
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