What's the difference between pneumatograph and stethograph?

Pneumatograph

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Definition:

• (n.) An instrument for recording the movements of the thorax or chest wall during respiration; -- also called stethograph.

Example Sentences:

Stethograph

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Definition:

• (n.) See Pneumatograph.

Example Sentences:

• (1) In addition, in some animals respiratory responses were measured stethographically.
• (2) Electromyographic activity was related to respiratory phases as recorded by a stethograph around the chest wall.