Page 115 - My FlipBook

ARTIFJCIAI. dentures; KLKCTK()-J)Kl'()SI'r. lO'

is known as the " single-cell " pn3cess. This form f)f hrit-
tery is shown in V\g. 6i. A indicates the outer jar; I), the
porous cup or cell, wliicli is soniewliat taller tliau the con-
taining vessel; C, the zinc (amalgamated), which is made
from a strip of sheet-zinc, and is suspended by means of a
copper wire; while D represents suspended plaster casts.

Fig. 6i.

Preparation of Solutions.—Make a saturated solution
of copper sulphate (blue-stone) by dissolving crystals of
that substance in hot water. This should always be of
sufficient strength to have a few of the crystals remain
suspended. The solution, wdien cold, is poured into the
outer jar. The solution used in the porous cup or cell is
dilute sulphuric acid (sulphuric acid i part, water lo parts),
which should stand a little higher in the cell than that in the
outer jar. This should be replenished about every 24 hours
when in operation.
Amalgamating the Zinc. —Thoroughly cleanse the zinc
by washing it in dilute sulphuric acid. This is best accom-