Page 167 - My FlipBook

CYLINDER OR BLOCK FILLING. 163

cutting a sheet of foil into two or three pieces, then
roll them diagonally on a steel wire or rod; the size
of this wire will he determined by the required length
of the blocks, as there should be blocks of different
lengths, the wires should be of different sizes, and range
from No. 2 to No. 12 of White's bur gauge plate.
The size of the wire will be determined by the depth
of the cavity. The wire being withdrawn, the foil is
compressed to a strip. These strips are now rolled
squarely upon a No. 20 steel wire ; the size of the

cylinder being determined by the size and form of the
cavity to be filled. These may be used either in
their cylindrical form, or compressed and doubled.
The cavity formed, and the blocks prepared,. the next
step is their introduction.
Introducing the Blocks.—For placing the gold into
the cavity the plugging pliers will be required ; the

points of which should be curved, so as to make the
most perfect approach to the cavity. The points,
too, if properly formed, may be used to some extent
for condensing the blocks. All things being ready,
with suitable napkins and guards for the protection of
the cavity against the encroachment of moisture from
the saliva and breath, the fingers of the left hand
should press upon the napkin, and also hold away the
soft parts. If there is an angle, a small block should
be first introduced with the pliers into the proper