Abstract
A short account of an experiment to improve the directional quality of deep water echo sounding equipment. A comparison is made between the results obtained with the pre-war sonic deep water echo sounding set then fitted, and the present-day supersonic type of equipment now installed in the R.R.S. Discovery II. Methods of stabilizing the transmitter and receiver to overcome the effect of rolling on the narrower and, hence, more directional beam of sound now transmitted, are discussed. A short description of the method adopted is followed by particulars of an attempt to increase the amount of energy transmitted, by a reduction in thickness of the hull plating, in way of the stabilized transmitter and receiver.
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