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Updated: May 22, 2025
It is possible to make use, as did M. Coulier as early as 1875, of this phenomenon to carry off the germs of condensation, by producing by expansion in a bottle containing a little water a preliminary mist which purifies the air. In subsequent experiments it will be found almost impossible to produce further condensation of vapour. But these forces may also be of electrical origin.
In order to bring out any traces of ink-marks which have been so far removed as not to be observable by the naked eye, Coulier recommended the placing of the document between sheets of white filter paper and passing a hot flatiron over it, allowing the latter to remain on the spotted parts for a short time.
To the presence of dust in the higher atmosphere we owe the formation of mists, clouds, and gentle beneficial rains, instead of water spouts and destructive torrents. It is barely twenty years ago since the discovery was made, first in France by Coulier and Mascart, but more thoroughly worked out by Mr. John Aitken in 1880.
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