Mr C Harrison breaks a speed record with his speedboat powered by an outboard motor.
Full title reads: The Welsh Harp. For the only speed record we don't possess! Mr C Harrison - in First trials - attains speed of 57 1/2 mph easily beating America's record for outboard motorboats."
The Welsh Harp, Hendon, London.
A speedboat driver sits in his boat while a man talks to camera (I think the driver is Harrison and the speaker may be Mr J W Shellan) standing on jetty.
The boats outboard motor is started up and it moves away into the water.
Various shots of the boat speeding up and down. I think the boat is 'Non-Sequitur X'.
N.B. possible alternative spellings Non-Sequitor / Non Sequitor.