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Weather Bureau, meteorgraph to see how fast the wind is blowing circa 1936.
UMG21A22_405

Weather Bureau, meteorgraph to see how fast the wi...

Man with a recording mercurial barograph, an instrument made and perfected by the U.S. Weather Bureau which measures, on a magnified scale, the fluctuations in the pressure of the air circa 1936.
UMG21A22_407

Man with a recording mercurial barograph, an instr...