Abstract
In the years from 1922 to 1936, G. W. Stewart and his students investigated the properties of transmission lines and acoustic filters. Recently a box that contained most of these filters was discovered in one of the attic rooms of the physics building he designed. The filters are formed from a central small diameter tube with side branches of various types. Some transmission lines have a single side branch and others have a small number of identical side branches. The experiments of the expected transmission by the filters were done by Stewart and his students with sufficient accuracy for a comparison with theory. Electric transmission lines formed the model of construction and analysis of the filter response. The general method of analysis is that used for chains of identical lumped parameter networks. Stewart used telephone receivers for sound sources and his hearing or Rayleigh disks for detectors. Transmission lines and filters based on the Stewart filters could be used with modern sources and detectors in an acoustics laboratory.
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