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126 MECHANICAL DENTISTRY AND METALLURGY
Dr. Baker's Method. —The appliance known as the
Baker velum is illustrated in V\i^. 82. It consists of a gold
or hard rubber plate covering the roof of the mouth down
to the junction of the hard and soft palates. From this
point the movable portion, F, extends back and downward,
restoring symmetry of the palatal surface by bridging across
and lying upon the muscles of each side. The spring, CE,
Fig. 83.
controls the upward movement of the bulb, F, the distal
surface of ^vhich, G, is quite broad, and so constructed as to
articulate with the pharyngeal wall, while the constrictor
muscle contracts and closes around it on a semicircle. This
is the Suersen principle, with the addition of the spring
attachment, to further facilitate the acquirement of correct
articulation. The Baker appliance in position is shown in
Fig. 83.
