. The principles and practice of dental surgery. g the flame-end tothe mouth-piece by from six to twelve inches of flexible will be found to be a very valuable modification. The mouth-blow-pipe requires for its use a peculiar manage-ment of the muscles of the chest, cheeks and palate, by virtueof which an uninterrupted and regular current of air is thrownfrom the lungs through the pipe. The art once learned, is neverforgotten. But many will not master the first difiiculty of learn-ing it, and become the slaves to mechanical appliances, which,however useful for many purposes, can ne
. The principles and practice of dental surgery. g the flame-end tothe mouth-piece by from six to twelve inches of flexible will be found to be a very valuable modification. The mouth-blow-pipe requires for its use a peculiar manage-ment of the muscles of the chest, cheeks and palate, by virtueof which an uninterrupted and regular current of air is thrownfrom the lungs through the pipe. The art once learned, is neverforgotten. But many will not master the first difiiculty of learn-ing it, and become the slaves to mechanical appliances, which,however useful for many purposes, can never supply the placeof this simplest and best of all blow-pipes. Blow-pipes working by artificial blast are divided by ProfessorAusten into four classes: 1. Alcoholic or self-acting blow-pipes;2. Mechanical or bellows blow-pipes; 3. Hydrostatic blow-pipes;4. Oxo-hydrogen or aero-hydrogen blow-pipes. Of each of thesewe shall give an example. To enumerate all the forms that in-ventive talent has devised would fill too much of our space. Fig. The SELF-ACTING blow-pipes derive the force of their blast fromthe vapor of hot alcohol, which, igniting as it passes throughthe flame, adds to the intensity of the heat. A somewhat com-plex, but very complete, blow-pipe of this class, invented byDr. Jahial Parmly, is shown in Fig. 214. The lamp (G), supplied from the reservoir (D D), heats the 674 SOLDERINa. Fig. 215. alcohol in globe (I), supplied from the reservoir (J) through thepipe (N). The elastic vapor escapes at the jet (P), giving in-tensity to the large flame (L), which receives its supply of alco-hol from reservoir M J. Both upper and lower wick tubes have movable cylinders for regulating the flame, A small charcoal-furnace (R) may be brought in range of the flame for meltingpurposes. Smaller and more portable lamps are made, of which quitea number of different patterns are to be found in the depots. The principle and generalplan of construction is veryclearly shown in Fig.
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