Abstract: A rechargeable photographic camera includes an interlock circuit that automatically inhibits operation of the camera flash when the camera is mated with a charging cradle, regardless of the condition of a manual on-off flash switch. The rechargeable battery of the camera therefore is assured of receiving a full charging current even if the flash unit is left on when the camera is mated with the charging cradle.

Abstract: A charging control device for a flash device is arranged to detect ambient temperature in controlling a flash device charging voltage and to perform the charging control up to a level corresponding to the temperature detected, so that the flash device can be allowed to flash at a constant guide number irrespective of any changes in temperature.

Abstract: A container sidewall comprises a plurality of sections each section comprising an extruded aluminum post formed of a tubular rectangular tube having a pair of oppositely extending flanges coplanar with one of the tube broad sides and an aluminum plate riveted to each flange. An identical post interconnects the plates of adjacent sections. A reinforcing hat shaped rib is riveted to each plate midway between posts. The outer wall of the post tube is thicker than the inner wall which is the same thickness as the plates. The tube sides are thinnest to save weight. The plates are relatively thick to preclude damage during normal use. The tube is dimensioned to withstand transverse bending loads and bowing of the sidewalls to preclude damage in a rail car well.