Tag Archives: Schnepf

Spirometer, Schnepf, 1856

Spirometer_Schnepf_1856

From Comptes rendus hebdomadaires des séances de l’Académie des sciences, December 1856, page 1047. “Note sur un spirometre d’une sensibilite’ et d’une simplicite’ extremes par M.B. Schnepf”.

The spirometer bell was described as 35 cm high and 18 cm in diameter, the base cylinder was described as 30 cm high and 16 cm in diameter. The breathing tube was 15 mm in diameter.  Note that the chain varied in width (and therefore weight) along its length.  This was designed to vary the counter weight used to suspend the bell according to its depth in the water.