The temperature of the atmosphere at levels accessible to air‐waves

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Abstract
At the end of his valuable paper1 on “The temperature of the auroral region,” Professor Vegard devotes a paragraph to sound phenomena and atmospheric temperature. He expresses the opinion that the propagation of sound to great distances can not be due to the existence of a warm layer in the atmosphere at a height of about 40 km. The only substantial basis for this opinion is a laboratory experiment indicating that, when a loud‐speaker and a microphone are set up in a vessel which can be evacuated, the transmission of sound fails at a pressure of the order one cm of mercury. This is an interesting experiment but, to my mind, it tells us more about the efficiency of loud‐speakers than about the transmission of waves through the free atmosphere.

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