J.B. Fuller's lamp-hour meter (1878) Previous
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This meter was the first known AC meter to be patented, and like the Gardiner DC lamp-hour meter that preceded it, it only measured the time energy was supplied to the load. The meter was simply a clock operated by the alternating fields of the two coils. Lamp-hour meters were soon abandoned as customers started adding other electrical appliances and the need arose for meters that meters that measured energy, like Shallenberger's ampere-hour meter.

One of Jim B. Fuller's assistants was James J. Wood, who would soon become one of the key people at the Ft. Wayne Electric Co.

J.B. Fuller's meter
Westinghouse Handbook on Watthour Meters