100 Years Ago

摘要

A good deal has been recently heard about "holes in the air" in connection with sudden collapses of flying machines. Prof. W. J. Humphreys, of the Washington Weather Bureau, writing in The Popular Science Monthly for July, classifies the eight different types of atmospheric disturbance as follows:- A vertical group, including aerial fountains, aerial cataracts, aerial cascades, and aerial breakers, and a horizontal group, including wind layers, wind billows, and aerial torrents; in addition wind eddies fall under both groups. Holes in the sense of vacuous regions do not exist.