A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . uracy. For soldering all regulatingappliances, the skillful use of aperfect blowpipe is far prefer-able to a Bunsen Burner, orany stationary instrument. Inselecting a blowpipe, it shouldbe one that can be held lightlyin the hand, so as to be manip-ulated easily and quickly inresponse to demands. The Leeblowpipe, shown in Fig. 93,which is operated by the mouth,or bellows, is one that answersI ^>-^^^^B the purpose. The flame is con- trolled by the spring lever withwhich the gas
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . uracy. For soldering all regulatingappliances, the skillful use of aperfect blowpipe is far prefer-able to a Bunsen Burner, orany stationary instrument. Inselecting a blowpipe, it shouldbe one that can be held lightlyin the hand, so as to be manip-ulated easily and quickly inresponse to demands. The Leeblowpipe, shown in Fig. 93,which is operated by the mouth,or bellows, is one that answersI ^>-^^^^B the purpose. The flame is con- trolled by the spring lever withwhich the gas can be shut offto a small pilot light. For those who have air pressure, this blowpipe can beeasily modified to form one of the most convenient instruments for all purposes ofsoldering. This is accomplished by cutting an oblong finger-hole in the air tube ofthe blowpipe, through which is passed a short half-section of a thin tube curvedand contoured at one end, as shown below in Fig. 94, and soft-soldered to the insideof the air tube, as shown by the dotted lines, in such a position that the continuous Fig. ^ CHAPTER XVIII. CONSTRUCTION OF BANDS 153 stream of air under pressure is directed out through the hole. Arotind the hole issoldered an elevated rim beveled to exactly fit the end of the forefinger. This enables one to completely close the hole with a very light pressure. When the finger is in ^ —^^^^^^^ place covering the hole, the air is forced over Tl ^^^^^:..:.::::s, ^\^^ the curved inner lip and on to its work forming * —- —r - - r^ lY^Q aij- blast. A small spur is soldered to the side of the^ pipe to which is attached a fine spiral spring which connects with the gas lever. The flameis controlled with the thumb on the spring lever which when released shuts thegas down to the pilot light. At any moment the operator drops or hangs up theblowpipe, the spring lever is released, and the gas shut down to the pilot light,but not blown out by the air pr
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