Machines test the strength of floats used for seaplanes, Virginia, United States of America.
Full titles read: "A REAL BASIN-FULL - from Virginia ! [United States of America] This is claimed to be the world's largest basin or tank, for testing strength of floats, etc., in speed runs."
Several shots of large machines inside factory moving backwards and forwards along a narrow strip of water. Underneath the machine is attached a prototype float for a seaplane, which is pressed down onto he water to check its strength.