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86 MECHANICAL DENTISTRY AND METALLURGY.

become sufficiently hard, the portions of wax which tem-
porarily united the latter should be removed, and the sur-
faces of the clasps and plate, where they unite with each
other, coated with borax ground in water to the consistency
of cream; small pieces of solder are then placed along the
lines of contact, the investment heated in a furnace until
the plate acquires full red heat, when it is removed, placed
upon a suitable holder, and the solder fused with the blow-
pipe.
Another method consists in securing the proper relation
of the clasps to the teeth in the mouth by the use, in the first
instance, of what are termed " temporary fastenings." The
plate and clasps are first applied as accurately as possible
to the model, and are then connected by a narrow strip of
plate or piece of wire bent in the form of a bow, the con-

FiG. 53.

cavity facing the model, one end of which is lightly sol-
dered to the palatal side of the clasp, and the other to a con-
tiguous point upon the plate, as exhibited in Fig. 53, and the
pieces thus temporarily united are removed from the model
and adjusted to the parts in the mouth. If the position of the
clasps is found in any respects faulty, they can be easily and