Page 10 Advertisements Column 1

Dominion, Volume 19, Issue 155, 27 March 1926, Page 10

SPEEDOMETER TESTING

The Speedometer is intricate as a watch, requiring fine and accurate adjustment bv. a specialist. The Calibrating Machine, designed for testing Stewart Speedometers, consists of a powerful master instrument specially constructed, to which the Speedometer un.der 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 erraticallv at other speeds. This variation is corrected by adapting suitable hair-springs, of which the mechanic has 20 different tensions to Reject from, the final adjustment being bv 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 n rough test. Tie will have it adjusted by the Stewart specialist if necessary. . On Stewart Speedometer Service the sun never sets. —Advt.