Spirometer, Hutchinson’s, 1846

Spirometer_Hutchinson_Med_Chir_Trans_v29_p137–252_1846_2

Hutchinson’s original spirometer from his lecture article in Medical Chirurgical Transactions, Volume 29, pages 137–252,  1846.  This drawing is showing how to uncork the top of the spirometer so it can be returned to its starting position.

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