An automatic photographic recording apparatus is described. It uses plates sensitized to the red end of the spectrum for recording movements of organs of plants which cannot be photographed in white light. It enables one to obtain two types of pictures:
1. A "standing plate" picture where the successive positions of the organ to be registered are superimposed on the same plate, no motion being imparted to the plate.
2. A "moving plate" picture where, by means of a clock-controlled plate shifter, each successive picture is entirely separate from the preceding one.