The ordinary camera box (see fig. 5, a) varies in size
to suit the tube, and is termed medium, half, or whole.
Within the box is a slide to assist in regulating the focus,
and in enlarging or diminishing the picture. In one end of this
slide is a springed groove into which the ground-glass spectrum
(g fig. 5) is slid, for the purpose of more conveniently arranging
the focus. After the plate is prepared it is placed in the holder--
partly seen at e, fig. 5, and covered with the dark slide f, fig. 5;
the spectrum is then withdrawn and the holder takes its place,
and the lids d, d, are closed after removing the dark slide f.
The plate is now ready to receive the image, and the cap c
may be removed to admit the light into the box.

A camera constructed by Voitlander is thus described by Mr. Fisher.
"It is made entirely of brass, so that variations of climate has
no effect upon it. It is very portable and when packed in its box,
with all the necessary apparatus and materials for practising
the Daguerreotype art, occupies but very little space.
It is not, however, well adapted for the Calotype process."

"The brass foot A (fig. 7.), is placed on a table, or other firm support,
and the pillar B. screwed into it; the body of the camera, C, C is laid
into the double forked bearing D. D. The instrument is now properly
adjusted by means of the set screws, e, e, e, in the brass foot,
or it may be raised, lowered, or moved, by the telescope stand,
and when correct, fixed by the screw b. The landscape to be delineated
is viewed either through the
[hipho_7.gif]
small lens, g, or with the naked eye on the ground glass plate H,