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124 MECHANICAL DENTISTRY AND METALLURGY.
As will be seen, Fig. 79 represents the mouth without the
apparatus ; Fig. 80 shows it in position ; Fig. 81 gives a view
of the appliance itself.
The simplest manner of constructing the bulb is to leave
a small projection of rubber in the center of the posterior
border of the plate; then, after vulcanizing and fitting the
Fig. 81.
plate accurately to the mouth, build up upon this projection
a bulb composed of modeling composition ; construct this,
