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54 MECHANICAL DENTISTRY AND METALLURGY.
guide pin; //, safety cap; /, the blow off. It is altogether
a most simple and convenient Milcanizer.
Methods Employed.—After the flask has been carefully
packed and closed, place it in the vulcanizer with water

Fig. 26.

enough to fill the boiler about one-third full, not more. If
two or three cases are to be vulcanized at the same time, the
same amount of water is sufficient. Place the top of the
vulcanizer in position and screw down. Light the lamp
or gas and regulate it so as to require a half hour to raise
the temperature to the vulcanizing point, 320° F., or 120
pounds pressure by steam gauge. This is, of course, for
ordinary work where for any reason the rubber is unusually
;
thick, the time for running it up should be extended to one
hour, or an hour and a half, or more, according to the