of the die may be adjusted and held with great nicety, with ether or with water mixed with alcohol or vinegar. while wear, at the same time, is compensated for in a very It is difficult to choose between the different ways of smok- simple and effective manner. ing. I give preference to the… … ing the thread above the normal surface of the material ope- pers, with leaf gutta percha, to isolate them and preserve rated upon. The die alsoallows of nuts and bolts for dif- them from the action of the sulphur in the stoppers. The ferent purposes being made to fit together tightly or loosely,…
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