Disassembly and inspection of a Magnetic Speedometer
Very early Smiths Speedometer 1 of 3 videos showing operation and disassembly.
Second video of three showing the disassembly of very early Smiths speedometer
Short video on the early Smiths speedometer dial
Smiths governor speedometer testing device
Governor spring comparator, for Smiths Governor speedometers
Inside view of a governor assembly of the Jones Motorola rev counter.
Rolling tube speedometer from 1955 De Soto. American car.