Intermittent pressure respirators.

This film starts with an intertitle noting that it is intended to be used in conjunction with slides and should be projected at 16 frames per second. Intertitles indicate how to construct an emergency respirator. Two examples are seen made from different materials. A male demonstrator uses a novel method of holding up card pointers and indicating different parts of the process. The contraptions look very 'Heath Robinson' in construction. The End.