23,733. Beck, C. Oct. 30. Cameras; roller slides; shutters.-A camera with a roller slide and two shutters, one at the focal plane and one at the lens, is shown with the bellows removed. The rollers 12, 11 of the blind shutter are mounted between rollers 1 of the roller slide. The front 3 is mounted on metal runners 5 fixed in the middle of the hinged baseboard 7. To fold up the camera, the front 3 is pushed back, the stays 6 are disconnected, and the baseboard 7 is folded up on the back. The camera is supported by a metal frame 8, which is pivoted to the baseboard 7 so that it can be turned over the end of the latter in folding up the camera. The focussing is done by moving an arrow on the front along a scale of distances on the baseboard, lines being marked on each side of the arrow to indicate depths of focus for the different lens apertures. The lens shutter, which consists of two hinged plates 15, is closed while the roller blind shutter is being set by turning the button 25. To make an exposure, the button 16 is depressed, a movement which, acting through the links 17, 18, 20, or through a flexible shaft, opens the shutter 15, then lifts the pawl 14, which releases the roller-blind shutter, and makes an exposure. The blind shutter has two apertures, one equal in size to the aperture 2 in the back of the camera, and a narrower aperture for more rapid exposures. There is an adjustable stop arrangement in the blind roller 12 by means of which either of these apertures can be used. This stop arrangement consists of anaxial screw actuated by the roller 12 and thus moved lengthwise, till it comes against a stop and arrests the shutter. For a time exposure, the large aperture of the roller blind is brought opposite the opening 2 and held there by the pawl 14, which is locked by a sliding plate 81. The time exposure is then made by the front lens. A method of holding the spools of roller slides so that they can be easily removed or inserted is described. A spring is placed at one end of the spool so that it can be pushed back to liberate the other end.