The ferrotype and how to make it - The Grian Press

68 THE FERROTYPE.
the plates prep-c? ratory to their being immersed in
the silver bath, bottles of various designs are
used, some of which are patented and others are
not. Most of them are designed so as to permit
the Collodion to flow outward quite easily from
an orifice just large enough to allow the surplus
Collodion to be turned back into the bottle from
the plate ; this is to prevent evaporation as much
as possible, while they are provided with covers
instead of stoppers to keep them free from dust
hence their name, " cometless bottles/' There is
a bottle recently invented and patented which
filters all the Collodion used, but from its liability
to excessive evaporation during warm
weather, its use is not recommended during that
season ; vhile for the cold season it is entirely
satisfactory. The larger sizes of the " cometless
bottles" are very useful, for when kept in con-
stant use all day, there is sufficient space in the
bottom lor all sediment which may form and be
deposited, to remain at rest without being dis-
turbed by the agitation incidental to flowing
plates.
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