The tube containing the lenses is to be mounted on a box (camera-box) as in [Fig. 15]. For this purpose there are several patterns of boxes, from among which I have made two selections of the most approved, and represent them by cuts, Figs. [16], [17], [18].
Fig. 16.
Fig. 17.
Figs. [16] and [17] represent a bellows-box which is probably more in use than all the other patterns together. They serve both for copying and taking portraits from life. A is the base; B is the back and sliding-box; C, bellows, which admits of extension or contraction; D is the opening to receive the carriage A, [Fig. 17]; E is a thumb screw to hold the sliding-box at any required distance. [Fig. 17] represents the plate-holder and ground glass frame.
A, carriage to pass through D, [Fig. 16]; B, frame for ground-glass, which may be turned in a horizontal or perpendicular position; C, a movable plate-holder held in place by means of springs; D, reducing holder, with bottom and plate to hold the glass plate: any size of reducing frame can be put in frame C; E E, spring bottom to keep frame D in place; F, slide; G, thumb-screw, when the carriage is to be put in or taken out of the box, Fig 16; H H, spring bottom to hold B in place.
Bellows-boxes can be obtained which receive the plate-holder from the top, the same as in the copying-box, Figs. [15] and [18]. The common wood, or "copying-box," is represented by [Fig. 18].