The ferrotype and how to make it - The Grian Press

CONCLUSION.
165
rich, velvety black, with freedom from fog, is
a saturated solu-
to proceed as follows : Make
tion of protosulphate of iron, into which drop
a solution of tannin, shaking the mixture all
the while, until the precipitate of taonate of
iron ceases to be redissolved ; then _add drop
by drop of a weak solution of nitric acid until
the precipitate is dissolved and the iron solu-
tion becomes of a clear bluish color. To one
ounce of this add ten or eleven ounces of water,
and as much acetic acid as may be found ne-
cessary. This constitutes the developer.
The patents of Wing and Southworth, alluded
fco in pages 42 and 43, have finally been decided
invalid, and there is now no restriction in the
matter of making or using cameras with sliding
shields. This result was only reached after
years spent in litigation, and the expenditure
of thousands of dollars. In the meantime the
publishers have made and improved these
boxes, until they now not only excel in sim-
plicity, but in finish and ornamental character,
all others. These cameras are specifically
known as the "Success" Cameras, and the
large sale of them attests the correctness of the
name. They combine all the recent improve-
ments. A photographer who possesses a Suc-
cess or Climax Camera Box, a Dallmeyev Por-
trait Lens, a Bowdish Camera Stand, and a
Bowdish Chair, is provided with the most
effective instruments now known to the trade.