Shaking apparatus for the aeration of bacterial cultures.

A large shaker designed to satisfy simultaneously and without mutual interference the conflicting demands of a team of bacteriologists, has been placed in one of this Institute's hot-rooms. The shaker runs at a constant speed of 100 shakes/min., but each user is free to select an amplitude of reciprocative motion to suit his requirements, by placing a loaded tray at a suitable distance from the centre of oscillation. This can be done without stopping the motion of the apparatus.