In making slides
by contact, select the negative and place it in the printing frame
and put the lantern plate upon it, film to film. Clamp down the
back and expose just as in making a print. A good method of
exposing is to hold a lighted match about 3 in. from the frame for
three or more seconds according to the density.
Development is carried on in the same manner as with a negative.
The image should appear in. about a minute, and development should
be over in three or four minutes. If the exposure has been
correct, the high lights will stay white throughout the
development and will come out as clear glass after fixing. It is
best to use the developers recommended by the manufacturer of the
plates used, the formulas being found in each package of plates.
It is best, also, to use a plain fixing bath, which must be fresh
and kept as cool as possible in hot weather.
The lantern-slide film that is new on the market can be handled in
the same manner as the glass-plate slide, except that the binding
is different. The results are the same and the slides are not so
bulky to handle. Being unbreakable, they are much used by
travelers.
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