Abstract
This article describes an automatic vibroscope of a compact type simpler than the one perfected by Mackay in 1958. Its features include a vibrator to set a fiber in motion, a simple photo-electric transducer to detect fiber vibrations, a direct coupled amplifier of detected electrical signals and a method to adjust the signal phase.
The article shows how to build and operate the new apparatus, and refers to the happy combination of direct coupled amplifier and the pickup-transducer of fiber vibrations. It will be found that this apparatus also does the work of the so-called vibroscope.
Experiments to measure fiber deniers were made under the usual operating conditions with the use of this apparatus, and the sensitivity and accuracy of measuring will probably give a new appraisal to the automatic vibroscope.
Some of the experiments made by the author with the new apparatus may, it is hoped, solve problems, not approached hitherto, on the use of the vibroscopic method.
