Spirometer, Modified Hutchinson, 1898


Purported to be a Hutchinson spirometer in the text of the article, this looks a lot more like a conglomeration of several different designs instead.  The manufacturer was not named but was likely German.

From Das Stottern. Eine Monographie für Aerzte, Pädagogen und Behörden by Hermann Gutzmann, published by Rosenheim, 1898. page 148.

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