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1,185,733. Handling slides; slide mounts. MINNESOTA MINING & MFG. CO. June 13, 1967 [June 14, 1966], No.27326/67. Headings G2C and G2J. A mount for a photographic transparency comprises two frames 10, 20 snap fitting together under compression for retaining a transparency therebetween, the frames having longitudinal fins 13, 14, 15, 26 which inter-engage with the fins of a similar mount to allow a stack 30 of mounts to be formed. The mounts are assembled in a stack by relative lateral sliding, a pin (31, Fig. 3 not shown), of the frame 10 engaging a depression 32 of the frame 20 to prevent further undesirable relative movement. The upper edge of the frame 10 is formed as an extended rack tooth 11 and is slotted at 12 so that when an inverted stack is placed in a projector, the edges 11 form a rack which co-operates with pinion mechanism of the projector. Alternatively, each edge 11 may be formed as a series of gear teeth and the projector have an inter-meshing pinion mechanism. The stack may be provided with terminal members similar to the slide mounts but in which the frame 20 has no central opening to protect the slides in the stack. The edges 34 of the mounts may be used to carry identifying indicia.