Fig. 17 illustrates the external appearance of the folding camera. This class of camera is more especially arranged for use with films rolled upon spools. Most makes, however, are so made that adapters for glass plates can be readily attached. These adapters are provided with ground-glass focussing screens, and the plates are carried in holders or dark-slides in exactly the same manner as for the stand camera, which in its general characteristics the folder resembles, being provided with bellows between the front and back, but it lacks many of the mechanical movements of the other. It is most frequently used entirely as a hand camera for films. Its portability when closed and its light weight when loaded make it a most convenient companion for the photographic tourist. Fig. 18 is a sectional view of the folding camera. A is the chamber into which the bellows, the front and its fittings close. The baseboard, B, acts as the door and shuts all in. The leg, C, is provided to support the front in a level position, if the camera is standing open upon a table or any similar support when making a long exposure. The baseboard has an extending portion worked by the milled screw, D. This extension has metal guides, along which the stage of the front, E, is drawn until it reaches a stop-catch. The front can be raised or lowered by loosening the milled screw, F. The view-finder, G, is carried at the top of the stage upright and, being provided with a universal screw, it may be arranged for either upright or horizontal pictures.
The interior of the chamber, A, has two compartments, one for the accommodation of the bellows, etc., the other is closed and is for the protection of the i 1ms. Fig. 19 gives a view of the open back; A, is a loaded spool of unexposed films, and B is an empty spool to receive the exposed films. More will be found relating to this under "Loading the Camera."
This is done by racking out the bellows. A little bone or metal plate, engraved with distance numbers (one set for films and one for plates), will be found attached to the baseboard, and to the movable portion a small pointer is fixed.
Fig. 20 will explain the arrangement. The adjustment is made to suit the distance of the object to be portrayed.