The 2” speedo was of the magnetic type still used today.Ī magnet which is close to a metal disc is rotated by the drive cable and “drags” the disc round with it.
S xxx/x/x OR SCxxxx/xx for speedo RC xxxx/xx for Tacho Type identification numbers on the dial start The distance is calculated by a series of gears and ratios which move the numbers round. The speed is calculated by the same principle as used in clocks and watches which gives very accurate readings. This in reality is a two in one clock a speed recorder and a distance recorder. The larger 3” instrument was of the Chronometric type. Smiths often badged their instruments Jaeger or Smiths.Regarding Smiths speedometers a major change was made in 1964
Around 1927, Smiths Motor Accessories purchased this company and re-named it British Jaeger.įor a long time the dial faces, either with the British Jaeger or Smiths logo on them, also had a credit to Jaeger Jaeger patent. Sometime in the late 1920's, Jaeger Paris set up a company in England, Jaeger Ed., with two British directors and one French director. The Chronometric speedometer / Tachometer is a principle commenced by the Jaeger speedometer company in Paris, France, in the 1920s and as such is a METRIC instrument, that is the dimensions, screws, threads etc are metric and not imperial as generally thought.įor example on the motorcycle instrument, considered to be 3” dia., with a 26tpi thread, the bezel is 80mm dia. Restoration and Bespoke Printing service. We are pleased to be able to offer a complete dial We also supply Top Quality British made Cables and Drives Please Contact US with your requirements for a firm quotation. Email over 400 Concours Chronometric Instruments in stock and 35 years experience in the Restoration / Repair and recalibration of Smiths Chronometric Instruments we are in a unique position to Supply - Restore - RepairĬhronometric Speedometers and Chronometric Tachometersīritish Motorcycle or Car Manufactured between 1930 - 1962Ĭhronometric Instrument Repairs from £45.00Īll work carries a full 12 month guarantee
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