. Electrical news and engineering . ARON METER Fig i5* accelerated as the case may be by the action of a coil or coil carryingthe main current in which the ball of the pendulum consisting of apermanent magnet oscillates. The principle of the gearing from whichthe motion of the pendulum is communicated to the dial is shown inEig. 16. When both clocks are going at the same speed the middle. DIFF E RENTIAL G-t AR 0«^ -r w r: A RON Me T Ef^F.^. /b bevel wheel is turned around on its own axis, but if one is going fasterthan the other the middle wheel is turned around on its axis and alsoaround on t
. Electrical news and engineering . ARON METER Fig i5* accelerated as the case may be by the action of a coil or coil carryingthe main current in which the ball of the pendulum consisting of apermanent magnet oscillates. The principle of the gearing from whichthe motion of the pendulum is communicated to the dial is shown inEig. 16. When both clocks are going at the same speed the middle. DIFF E RENTIAL G-t AR 0«^ -r w r: A RON Me T Ef^F.^. /b bevel wheel is turned around on its own axis, but if one is going fasterthan the other the middle wheel is turned around on its axis and alsoaround on the axis of the spur gears. This motion is communicaled tothe wheels operating the pointers on the dials, and it is only wherethere is a difference in the speed of the clocks thai the meter meter possesses the great .advantage of recording, no mailer howhow small the amount of current is. In the next figure we show the principle of one of the clock meters CAI^ADlflN EbECTRlGflU NEWS July, 1S96 that is used in this country to considerable extent. It is neither anamperehour or wattmeter, simply a time recorder, that is, it recorils thenumlier of hours the current has been flowing in a circuit. It is calledthe Pattee Lamp Hour Recorder. It consists of an ordinary clock inwhich is placed an , which is so arranged that when cur-rent is turned on a spring is r
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