Spirometer, Eckert’s, 1860

Spirometer_Eckerts_1860

US Patent 26754 by Augustus Eckert of Dayton, Ohio. 1860.  A non counter-weighted water-seal spirometer.  Two of the patentable features were a guide rod (B) to keep the inner bell straight and an air-filled water-tight chamber in the rim of the bottom of the inner bell (buoy, E) that served the same purpose as a counter-weight.  The cork (D) was removed after a vital capacity effort had been made and recorded to allow the bell to be returned to its lower position.

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