<P> In 1894 Oliver Shallenberger of the Westinghouse Electric Corporation applied the induction principle previously used only in AC ampere - hour meters to produce a watt - hour meter of the modern electromechanical form , using an induction disk whose rotational speed was made proportional to the power in the circuit . The Bláthy meter was similar to Shallenberger and Thomson meter in that they are two - phase motor meter . Although the induction meter would only work on alternating current , it eliminated the delicate and troublesome commutator of the Thomson design . Shallenberger fell ill and was unable to refine his initial large and heavy design , although he did also develop a polyphase version . </P>
<P> In 1894 Oliver Shallenberger of the Westinghouse Electric Corporation applied the induction principle previously used only in AC ampere - hour meters to produce a watt - hour meter of the modern electromechanical form , using an induction disk whose rotational speed was made proportional to the power in the circuit . The Bláthy meter was similar to Shallenberger and Thomson meter in that they are two - phase motor meter . Although the induction meter would only work on alternating current , it eliminated the delicate and troublesome commutator of the Thomson design . Shallenberger fell ill and was unable to refine his initial large and heavy design , although he did also develop a polyphase version . </P>
where are the induction type energy meters used
where are the induction type energy meters used
on alternating current
on alternating current