As mentioned in the previous post on Jones tachometers this second post contains the calibration instruction for the Jones centrifugal mechanical tachometerand completes the information I have on them.
They differ from the Smiths centrifugal speedometer and tachometer in the method of calibration and is more precise as a result. The Smiths instrument had a dial scale which was not linear whereas the Jones is linear. This meant the Smiths instrument had a series of different dial scales available as part of the calibration method, some seven different dial for their 60mph speedo for example...I will do a post on the Smiths centrifugal/governor speedometer in a future post...
Service Instructions for the Jones Motrola 5100-5200 series speedometer and tachometer..
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They differ from the Smiths centrifugal speedometer and tachometer in the method of calibration and is more precise as a result. The Smiths instrument had a dial scale which was not linear whereas the Jones is linear. This meant the Smiths instrument had a series of different dial scales available as part of the calibration method, some seven different dial for their 60mph speedo for example...I will do a post on the Smiths centrifugal/governor speedometer in a future post...
Service Instructions for the Jones Motrola 5100-5200 series speedometer and tachometer..
