. The principles and practice of dental surgery. 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. blow-pipe contains no oxygen, is well known to every enlight-ened dentist, and may be proven by placing a rod of polishedmetal in the flame for a few seconds, in which case it will beseen that the surface of that portion of the rod occupying thecentre of the flame does not unite with oxygen, however greatthe degree of heat may be; but if a jet of atmospheric air bethrown
. The principles and practice of dental surgery. 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. blow-pipe contains no oxygen, is well known to every enlight-ened dentist, and may be proven by placing a rod of polishedmetal in the flame for a few seconds, in which case it will beseen that the surface of that portion of the rod occupying thecentre of the flame does not unite with oxygen, however greatthe degree of heat may be; but if a jet of atmospheric air bethrown into the flame upon the rod, it will oxidize as readily asif heated by any other means. This little experiment proves,not only the want of oxygen in the flame, but it leads to thevery important conclusion, that, without oxygen, the burning ofthe vapor mnst be gradual and imperfect. In consideration ofthis fact, the writer was led to make the experiment of produc-ing a more perfect combustion by throwing into the flame one ofits supporters. This may be done in several ways, but the sim-plest and most convenient is atmospheric air, thrown in by meansof a bellows. The air from the lungs will not do as well, inas-much as
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