PHOTO-MICROGRAPHIC APPARATUS. 
49 
selves, two problems not infrequently occur—the first 
is where a reproduction is required larger than the size 
he is in the habit of using, and where “ enlarging ” in 
the usual photographic sense is undesirable or incon¬ 
venient; the second is when the object to be copied 
is itself of larger area than usual, too large, for instance, 
to be grasped by ordinary microscopical objectives, 
or to be projected entire through the usual microscope 
tube. 
The first problem requires for its solution a large 
camera or a large addition to the existing photo-micro 
camera. We show on page 50 how at times we use an 
ordinary long camera for very low amplifications, and to 
this camera a length could be applied ending in a size of, 
say, whole-plate. But for this purpose, and for various 
others, a camera specially constructed will be found 
much more convenient and efficient, and such a camera 
is now to be described. The general worker will often 
have to photograph such objects as entire insects, 
sections of two, three, or even more inches diameter, 
and such a camera used with short focus photo lenses 
will be found to provide the means. 
Fig. 15 shows an apparatus made by Mr. C. Baker 
to the writer’s design, and it answers the above pur¬ 
poses admirably. The light A may be of any kind, 
but in this case is a paraffin lamp with a wick one inch 
wide. In the figure it is shown wrapped round with a 
piece of black paper which is not necessary in practice. 
Next to the light is a paralleliser B of 3^ inches dia¬ 
meter, 4 inches might be better. Next comes a plain 
stage C with several plates having apertures cut to suit 
