Julius Elster (1828–1920) was a German physicist and engineer known for his contributions to the fields of thermodynamics, electricity, and instrumentation. He is notably recognized for his work in the development of measuring instruments. Elster is particularly well-known for his collaboration with Wilhelm Geitel, with whom he created the Elster-Geitel meter, an innovative device for measuring gas consumption, which laid the groundwork for modern gas metering technology.
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