Spirometer, Biedert, 1891


A bellows spirometer designed to provide compressed and rarified air based on the therapies developed by Waldenberg in the 1870’s. This spirometer was designed/manufactured by Biedert.  Found on Flickr.   Attributed to “Therapeutisches Lexikon : für praktische Ärzte”, by Anton Bum and Carl Breus, published 1891, page 676.

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