A practical treatise on artificial crown- and bridge-work . model and articulation made to fiicilitate the subsequent con-struction. Dr. Knapps method of constructing bridge-work is similar tothat in general use except in the investing and the soldering ofthe parts together, the latter being done with the blow-pipe in amanner similar to that above described. Figs. 470 and 471 illustrate specimens. Dr. Knapps compound blow-pipe (Fig. 472) consists of aminiature blow-pipe in which the ordinary illuminating gas(carburetted hydrogen or coal-gas) flame is combined with acurrent of nitrous oxide fro
A practical treatise on artificial crown- and bridge-work . model and articulation made to fiicilitate the subsequent con-struction. Dr. Knapps method of constructing bridge-work is similar tothat in general use except in the investing and the soldering ofthe parts together, the latter being done with the blow-pipe in amanner similar to that above described. Figs. 470 and 471 illustrate specimens. Dr. Knapps compound blow-pipe (Fig. 472) consists of aminiature blow-pipe in which the ordinary illuminating gas(carburetted hydrogen or coal-gas) flame is combined with acurrent of nitrous oxide from a cylinder of the condensed combination of these gases in combustion forms essentially 230 ARTIFICIAL CROWN- AND BRIDGE-WORK. a carbo-oxyhjdrogen flame.^ By means of a yoke and set-screw, the valve of the cylinder is connected with the tubes andvalves of the blow-pipe, so that the proportions of the mixture Fig. 472.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcrowns, bookyear1889
