A friend of mine is restoring a 1936 Series 1 Coventry Climax 4/4
When he tested the speedometer by rotating it with an electric drill, he
found that the speed registered jumped up in increments of about 5 mile per
hour instead of the needle moving smoothly. Likewise it comes down in
increments rather than smoothly when the speed is decreased.
An instrument maker suggested to him that this old speedo is activated by a
clockwork mechanism and that this incremental motion is normal.
My only experience is of speedo's driven by a magnet in a drum, and these
move the needle smoothly.
Can anyone tell us whether this incremental motion is normal, and perhaps
explain how these old speedo,s work?
John Mott
1981 4/4 4 seater
Western Australia
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