John Dowson in the Lightweight Special he built with Alec Issigonis using mainly hand tools. The car is often on display at the Gaydon Museum.
That's a Potvin crank driven blower which as you say were almost obsolete by about 1964/5. They were replaced by the ubiquitous GMC 6/71 top mounted belt driven jobs - the ones you collected in the face if you dropped a valve.And the one of him in the dragster's interesting as the car has a front mounted blower, most unusual at that time.
Most the European machinery that I can readily think of had direct crank driven blowers, usually at the front. AU's was vertically mounted at the rear and I think the Alfa straight 8's were low down on one side, driven from the power take off in the centre of the crankshaftThe pre War ERAs, with the exception of R4D, had their blowers fitted at the front of the engine.
Sorry! Couldn't resist.had its Shorrocks . . . . . . between the driver's legs.