Thomson walking beam meter (1888, 1889) Previous
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This meter was developed by Elihu Thomson and was so complex and delicate it is almost inconceivable it was developed by the same person who developed the robust and very successful Thomson Recording Wattmeter! A heating element was connected into the circuit and warmed the lower bottle closest to it. As the alcohol warmed, it evaporated and flowed into the opposite upper bottle. This would upset the balance, shifting the other lower bottle closer to the heater and emptying the upper bottle that was just filled. As the meter rocked, an escapement drove the register which was marked off in lamp-hours. Thomson walking-beam meter
Schenectady Museum Archives