ment. They come a size or
two larger than the negative with which they are to be used, and can
easily be cut down to the proper dimensions. With it, also, other kits to
hold smaller negatives can readily be used. It is also simple with them to
fasten the negatives in place. If they extend beyond the box on either
side so much the better; greater lateral adjustment can then be made. The
negative box, Fig. 3, is best painted dead black inside in the section
GBCG, and white in the section AGGD. The reasons for this will be obvious
at a glance.

In enlarging from films it is well to place them between two sheets of
glass of proper size, and fasten the whole in the kit or negative-holder.
For this purpose use thin glass without flaws or scratches. If the films
are smaller than the opening in the kit, it is well to paste a black mat
on one of the glasses, when, after proper adjustment, the film will remain
in place between the two glasses with very little pressure.

Enlarged negatives are very easily made with the apparatus described. A
contact positive can be made, preferably on carbon transparency tissue,
and from this the enlargement made, or an enlarged positive made first,
and from this a contact negative. The latter plan is preferable, since it
admits of retouching on both positive and negative. Slow plates should be
used throughout. For those who do not care to go to the expense of
experimenting with large plates, I would suggest that good contact
positives be first made and from these negatives on bromide paper,
_Standard A_, _soft_. These negatives are treated as already described.
The best positive for this purpose is a thin one with full gradations of
tone from clear high light to deep shadow, without veil or fog, but free
from any suspicion of flatness.

CHAPTER V

ENLARGING BY ARTIFICIAL LIGHT

The apparatus for enlarging with artificial light is, as has been stated,
more expensive than that for use with daylight. The negative box and
screen, however, remain as given. But we need in addition two extra
pieces, a light-box and a pair of condensing lenses.

The form of light-box presupposes the choice of illuminant, and in this
there is a wide range. Suffice it to say that a kerosene lamp with one or
more one-and-a-half inch burners will be found suitable for very small
work or weak negatives. For larger work or stronger negatives a stronger
light will be needed.

Of these, the first in point of stre