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工作于内燃机点火系统的初级电源英国记录电气公司创造了一种汽车用新颖电轉速表,名叫“Cirscale”.此种轉速表不需机械驱动装置,只要把表的两个原接线柱接入点火系统的点火线圈与开关之间.
A primary source of power for the ignition system of an internal combustion engine British Electric Records has created a new type of electric tachometer for automobiles called “Cirscale.” Such a tachometer does not require a mechanical drive as long as the two primary terminals of the watch are plugged in Ignition system between the ignition coil and the switch.