SPEEDOMETER TESTING
The speedometer is as intricate as a watch, requiring fine and accurate adjustment by a specialist. The Calibrating Machine, designed for testing Stewart Speedometers, consists of a powerful master instrument specially constructed, to which the speedometer under test is connected. An electric motor supplies power to operate both. speedometers from the same shaft simultaneously at revolutions equalling road speeds varying from .1 to 75 miles per hour. All speedometers must be adjusted until they synchronise with the master head at every speed. A speedometer may function well up to 20 miles per hour but run erratically at other speeds. This variation is corrected by adapting suitable hair-springs of which the mechanic has 20 different tensions to select from, the final adjustment being by a magnet Which is minutely sensitive. In time the magnet loses strength and needs renewal. If doubtful regarding the efficiency of your Stewart Speedometer, ask your garageman to give it a rough test. He will have it adjusted by the Stewart specialist if necessary. On Stewart Speedometer Service the Sun never sets.
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https://paperspast.natlib.govt.nz/newspapers/HAWST19260329.2.42
Bibliographic details
Hawera Star, Volume XLV, 29 March 1926, Page 5
Word Count
177SPEEDOMETER TESTING Hawera Star, Volume XLV, 29 March 1926, Page 5
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