The Sea Flea, a crazy vehicle, half boat, half seaplane is tested on the Thames.
Item title reads: " "The Sea Flea" Which looks like a mixture of glider - seaplane, submarine & ship - "hops along" during trials on the Thames."
M/S of the boat at anchor with the crew on board on calm water. Side view of a sailor hand cranking the propeller. The propeller starts with spurt of exhaust smoke. M/S of the craft speeding up and down river, passing a long line of barges pulled by tugs. There are buildings and cranes on the embankment.
Note: see also *PM0702* 702.05 for alternative sequences. Grainy and poor contrast in places.