The ferrotype and how to make it - The Grian Press

36 THE FERROTVPE.
matters of no great importance beyond a certain
point; that is, the top light should not be less
than twelve feet square, the side being ot the
same width, extending from the top to within a
foot of the floor. In some galleries the lights
are exceedingly large, such as a length of 40
feet with a breadth of 20 feet from the top, ana
an equal length for the side—such an immense
area of glass is superfluous, as indeed may be
proved by work made in glass rooms of moderate
size. There is no better work produced than in
the galleries of New York, in no one of which
is there a light of greater dimensions than 16
feet, and some of the best have even less. The
light used by Mr. Kurtz, of New York, is the
combined top and side with northern exposure,
the top being placed at an angle of 45°, is 10
feet square, on which joins the side light, 10 feet
by 8 feet extending to the floor.
While the northern exposure is by far the best
for photographic purposes, it does not, nor can it
be constructed so as to exclude the sunlight;
various devices have been resorted to by diflerent
operators to obviate this difficulty, among whi(;h
board screens, awnings worked by pulleys from
the inside, and, lately, a form of blind similar to
the common outside window blinds with mova-
ble slats has been adopted, and found to be a
euccess—the slats are light frames of wood,
working on center pivots, and covered with
iBuslin, »??iivas, or. indeed, made entirely of