. The Dental cosmos. closely this is attached that part of theMason oxyhydrogen blowpipe which car-ries the needle valve, hose, and the gas inlet of this part anotherneedle valve is inserted, which regulatesthe quantity of illuminating gas used. 456 THE DENTAL COSMOS. The pressure gage is set to reduce thenitrous oxid; the needle valve set to givethe proper amount of nitrous oxid. Thisis all determined by experiment. Afterthe valves are once regulated to producethe proper flame, no further regulation isnecessary except, perhaps, at long inter-vals. All that is necessa
. The Dental cosmos. closely this is attached that part of theMason oxyhydrogen blowpipe which car-ries the needle valve, hose, and the gas inlet of this part anotherneedle valve is inserted, which regulatesthe quantity of illuminating gas used. 456 THE DENTAL COSMOS. The pressure gage is set to reduce thenitrous oxid; the needle valve set to givethe proper amount of nitrous oxid. Thisis all determined by experiment. Afterthe valves are once regulated to producethe proper flame, no further regulation isnecessary except, perhaps, at long inter-vals. All that is necessary is to open themain supply of illuminating gas, light theflame, then open the main valve of thenitrous oxid cylinder, and at once asteady oxyhydrogen flame is obtained, noheating of the nitrous oxid cylinder headbeing necessary, and no regulation of theproportions of gas each time the blowpipeis used or during its use in solderingoperations. Dr. D. A. Rosenthal, Pittsburgh, Device for Facilitating the Perfect. Adaptation of Backings and Solderingwith the Least Possible Chance of Check-ing Facings. This device consists of two wooden in-struments (Figs. 1 and 2) with depres-sions in each for the retention of a rub-ber cork, one of which is more flexiblethan the other. By placing the toothwith the pins up on the softer cork () and pressing the backing into placewith the other instrument (Fig. 1) thetooth is encased in a nesi of gold, protect- ing it all around. The pins should notbe bent before the tips are soldered, tips are desired. The pins are runthrough a piece of rubber dam, and a flat,V-shaped steel instrument is inserted be-tween them. (Fig. 3.) This instrumentis pushed forward while the pins are be-ing bent with a wooden instrument (), this action tending to prevent directforce being brought to bear on the porce-lain, which often causes a fracture beforethe case is even invested. As an additional safeguard againstchecking, the facings before invest
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
