noon
`` This thing has some drawbacks . Remember that if we had about ten million of these machines hung in the air of New York City , there would be a noticeable drop in the temperature . We 'd probably have an Arctic climate year in and year out . You know , though , how unbearably hot it gets in the city by noon , even on the coldest winter days , due to the heating effect of the air friction of all those thousands of blades . I have known the temperature of the air to go up fifty degrees . There probably will have to be a sort of balance between the two types of machines . It will be a terrific economic problem , but at the same time it will solve the difficulties of the great companies who have been fermenting grain residues for alcohol .