This instrument was devised by M. Paul Nadar, the celebrated French
photographer, but anyone can construct a similar apparatus. The
arrangement is shown in Fig. 83.
The slides A and B B are adjustable so that any sized picture can be
inserted and the sides closed round it to shut out the light from
behind. A silver print unmounted is made transparent with vaseline and
placed on the glass. Pieces of paper of various colors are placed in
the reflector, C, and by this means all kinds of effects can be
obtained. A landscape can be viewed as though under the pale reflected
light of the rising sun behind the mountains, which may be changed
gradually to the full light of day.
[Illustration: FIG. 83.--NADAR'S PHOTO-CHROMOSCOPE.]