Show photographing sounds sound bound photographs recording the noises in the cabins of imperial airways cross channel passenger airplanes whilst helst hll st in actual light flight ore are to be obtained by prof A al luw with a view to locating the actual source of the various sounds the big napier engines on many arny of the air clr expresses have already been silenced to a remarkable degree but it Is found that the propeller m c evolving at high speed and the vibration of the stay wires produce distinct noises and it Is with a view to tracing and eliminating these that protestor professor low Is to carry out tits hla experiments it Is hoped to produce a passenger air express in which the noise inside the cabin li Is actually less than anthe oa the latest express train |