Several shots from various angles and distances of two men testing gas respirator, of man fussing with chemical experiment in laboratory. Several shots of men carrying out unidentified experiments, adjusting electrical controls on panel, positioning model aircraft and starting fan of wind tunnel. CUs of model of seaplane hanging upside down in air flow, of fan starting, spinning rapidly. CUs of man carrying out experiment involving weighing of unidentified object on precision scale, model of seaplane visible in background. Several shots of man testing hull of model ship in test channel. Cut to men carrying out low temperature experiment, controlled temperatures in deep freeze room as seen through window. Shot through window of heavily dressed man checking aircraft radial engine in deep freeze.