The ferrotype and how to make it - The Grian Press

POSITIVE PHOTOGRAPHY. 21
that gentleman, with a most laudible abnegation
of self, communicated his discoveries to the pub-
lic.
As is well known, the Daguerreotype picture
receives its name from one of its discoverers; it
is taken on a copper plate with a silvered surface.
We have seen that the paper process and afterward
the glass-plates, coated with various or-
ganic substances, have greatly su})erseded the
silvered plate, especially in this country; but as a
branch of photographic art it forms an interest-
lu^ chapter.
The beautiful process by which the Daguerreo-
type picture is obtained was published to the
world in July, 1839, after the French Govern-
ment of the day had rewarded M. Daguerre with
a pension of 6,000 francs, and M. Isidore Niepce,
the son of Daguerre's colleague in the discovery,
with another of 4,000 francs, with a reversion of
one-half to their widows ; a liberal endowment,
worthy of imitation on the part of any enlight-
ened government.
Then follows a very lengthy and minutely particular
account of the })rocess for making Da-
guerreotypes, which would prove of no interest
to the readers of this work.
Of the Ambrotype, it is not necessary to say
more than that it, like the Ferrotype, is made by
the collodion process—the first on glass, the lat-
ter on Japanned iron—the history of the inven-
tion and manufacture of which is given else-