SPEEDOMETER TESTING.
The Speedometer is intricate as a watch requiring fine and accurate adjustment by a specialist. The Calibrating Macliine designed for’testing Stewart Speedometers consists of. a powerful Master Instrument specially constructed to which the Speedometer under test is connected. An Electric Motoi* supplies power to operate both Speedometers from the «ame shaft simultaneously at revolutions equalling road speeds varying from 1 to 75 miles per hour. All Speedometers must he adjusted until they synchronize 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 mecnamc has 20 different tensions to select from, the final adjustment being by a magnet which is minutely sensitive. In rim© the magnet loses strength and needs renewal. If doubtful regarding tho efficiency of your Stewart Speedometer ask your garageman to give it a rough test. Tie 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/HBTRIB19260329.2.45
Bibliographic details
Hawke's Bay Tribune, Volume XVI, Issue 87, 29 March 1926, Page 5
Word Count
175SPEEDOMETER TESTING. Hawke's Bay Tribune, Volume XVI, Issue 87, 29 March 1926, Page 5
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