Spirometer, Speck, 1892

Spirometer_C_Speck_1892

Designed to measure ventilation during exercise.  Subject inhaled from the spirometer on the left and exhaled into the spirometer on the right.  Counterweights were added as the left spirometer bell rose above the water level and removed as the right spirometer bell fell.  Originally from: Carl Speck, Physiologies des Menschlichen. Atmens nach eigenen Untersuchungen, 1892.

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