Fine Antique Clocks
How It Works
The Smiths Jeager NEMAG Speedometer
The NEMAG Odometer
Cleaning the NEMAG
Calibration of the NEMAG
The Magmo Speedometer
The AT Speedometer
Smiths Mechanical Governor
Smiths Mechanical Governor Speedometer Introduction
How the speedometer works
Service & Repair
Four Steps to Speedometer Service & Repair
How to check your speedometer calibration
Terms of Trade
How to check speedometer calibration
The Gearing Test
Disconnect flexible drive from speedometer head.
With gears in neutral, count the number of turns of inner shaft for six turns of the rear wheels when vehicle is moved forward in a straight line. (N)
Measure the rolling radius of the rear wheels with tyres at correct pressure – centre of hub to ground. (R) (in inches)
Apply figures to this formula: (1680 x N) / R = TPM No.
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Magnetic Speedometer Repair is the trading name for Flannery Restoration LLP.