Charles F Marvin (1858-1943), American meteorologist, standing next to a triple register device. Marvin was the chief of the US Weather Bureau between

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Charles F Marvin (1858-1943), American meteorologist, standing next to a triple register device. Marvin was the chief of the US Weather Bureau between 1913 and his retirement in 1934. He designed, built and improved many meteorological instruments and automated many to improve the accuracy and completeness of the Bureau's records. He conducted experiments to determine the constants in humidity equations, and developed humidity tables. He also invented the Marvin seismograph for measuring ground movements. The triple register recorded wind direction, wind speed and precipitation, as well as accumulated hours and minutes of sunshine.

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