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Abstract
It appears to be possible to correlate an acoustic rattle with a visual vibratory movement. This correlation has been used in order to measure the ciliary beat rate of respiratory mucous membrane. The accuracy of this subjective measurement is a function of the frequency and is proportionally constant up to 25 Hz. The standard deviation is about 10%. Above 25 Hz the correlation becomes unreliable. lnterchange of octaves does not occur. By means of this method the ciliary beat rate can be measured in the clinic in a simple way on large groups of patients.