Abstract: A wedge and wedge adaptor for fixing television camera or the like, to such as pan and tilt heads wherein the combination of wedge and wedge adaptor provides for each of location, automatic lock of wedge to adaptor, safety lock, a full unlock position and a frictional unlock position wherein the weight of the camera on the wedge maintains the frictional unlock position to retain the wedge in the adaptor and permits the operator use of both hands for removal of the camera, the frictional unlock position advancing to the full unlock position as soon as the weight on the wedge is reduced.

Abstract: A document recording machine of the flow camera type wherein the rotatable document carrying drum is co-axial with the film carrying capstan and having the same angular velocity, an optical reduction system having the same relative reduction as the reduction of peripheral movement of the drum and capstan and a further optical system for recording a serial number from a film carrying magazine to the film and a pivotable mirror in the further optical system is operable to alternately break the two optical paths.