SOME FEATURES OF ATMOSPHERIC EDDIES WITH APPLICATIONS TO THE VIBRATIONS OF TRANSMISSION LINES

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Abstract
Some conclusions regarding atmospheric eddies, derived from the records of a pressure-tube anemograph at St. Hubert Airport near Montreal, are applied to the problem of the vibrations of transmission lines, furnishing a meteorological approach to the problem recently discussed by C. D. Niven.It is found (1) that during glaze storms the wind at 60 ft. above ground is generally less gusty than the average; (2) that the mean duration of a gust varies inversely as the square root of the wind velocity, and is too large to resonate with the ordinarily observed period of "galloping"; and (3) that the steadiest winds invariably occur on nights of low wind velocity when a large negative lapse rate of temperature has been built up, leading to the small high-frequency vibrations due to eddies forming behind the cables.The meteorological conditions accompanying a recent destructive case of "galloping" form the subject of part of the paper.

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