Author: Kirkland, G W
First published: N/A
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Kirkland, G W
ALVAR LIDDELL : And now for a report about a recent Conference. In London last week the Institution of Structural Engineers held a 50th Anniversary Conference. Sir Alfred Pugsley, Professor of Civil Engineering in the University of Bristol, and until recently, President of the Institution, was at the meeting and tonight he tells us about some current developments in this important field of engineering.
A sound source in a room usually produces a diffuse (i.e. non-directional) sound field. The sound pressure level of this field depends on the energy emitted by the source and the amount of absorption by the surfaces of the room. Most of this absorbed energy is lost as heat but a small part is transmitted through the walls or floor and radiated into adjoining rooms causing another diffuse sound field. Ihsically it is the difference between these two sound ficlds which is the airborne sound insulation of a wall or floor.
H. J. Purkis
PROFESSOR H. J. COWAN was interested to note the comment by Mr. J. Bak on the effect of concrete encasement on the torsional resistance of steel sections and Mr. Terrington’s reply.