A pneumatic device for measuring the mean and upper-half mean fiber lengths is described. Air is drawn through a cotton fiber beard (formed with two combs) placed over a narrow slit to form the fourth arm of a pneumatic Wheatstone bridge. It is shown that the unbalanced deflection of the "pneumatic galvanometer" across the bridge varies correctly with the number of fibers over it to enable measurement of the mean value from curves automatically drawn by the device.
For seventeen cottons data are presented which compare the results of this method with those obtained with the Fibrograph.
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References
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Hertel, K.L. , TEXTILE RESEARCH10, 510 (1940).
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Hertel, K.L. and Zvigon, TEXTlLE RESEARCH6, 331 (1936).
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Klinger, K., The Melliand (English) 5, 692 (1929).
