Recording U-Tube Mercury Manometer

Manometer_Recording_Mercury_1898

A recording mercury U-tube manometer.  The float in the left side of the U-tube moves up and down in response to respiratory pressures.  The thin metal rod attached to the float had a recording pen at its tip.

From Das Stottern. Eine Monographie für Aerzte, Pädagogen und Behörden by Hermann Gutzmann, published by Rosenheim, 1898. page 149.

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