Soundtrack is currently missing for this issue.
Puget Sound, Seattle (?), United States of America.
Several shots of the largest seaplane built at this time, taking a trial run on a stretch of water. We don't see it actually take to the air, but it moves across the water with propellors...
A little quiz asks us to guess what different sounds are, played over a blank screen.
Guessing game quiz which involves everyday sounds being played over a blank screen.
A quiz asks us to guess what different sounds are, played over intertitles.
Mystery noises are played against a black screen - the source of the sound is then revealed.
A man is wired up to a machine to test his emotional reactions.
Japanese gong which holds sound for ten minutes.
Footage of sound recordists demonstrating how sound recordings are played back. London.
Scientists test the latest radio speaker in an echo free chamber, London.