Spirometer, A G Spalding, 1891


A Hutchinson-style spirometer with a dial read-out.  Posted on Flickr by circasassy.  Attributed to an A.G. Spalding & Bros. Gymnasium and Athletic catalogue from 1891.  At a guess, the dial displayed the exhaled volume and was driven by the cables attached to the counter-weights that are likely hidden inside the side supports.

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