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SPIROMETER (after Schneider)

Scientific device after Schneider, early 20th century

As the study of speech developed, new instruments appeared all the time, to measure and generate speech sounds. This spirometer from the Dresden speech science collection makes measurable the capacity of the lung.
The subject will inhale as much air as he or she can. When exhaled through the mouthpiece, the air is lead, via a pipe, into a bellows for measurement. Capacity can be read on a scale. The mask completely covers the mouth and the nose of the subject, so as to ensure the complete volume of the exhaled air is lead into the device.
With a long needle, placed on the measuring scale, the volume of air exhaled while speaking can also be measured, and registered by a kymograph placed next to the device.

Collection of Technische Universitaet, Dresden