Abstract
The two kinds of electrical precipitation dealt with were the natural and the artificial. Artificial pre-cipitation began with the well-known experiment which Sir Oliver Lodge showed to the British Association at Montreal in 1884 on the electrical deposition of smoke or steam; an observation which has now been applied on a large scale in Great Britain, by his sons and by Dr. Cottrell in the United States, to the recovery of metallic fume, and to the freeing of blastfurnace gas from solid material before combustion. The theory of the action is like that of the coherer,, and was considerably elucidated by the late Lord Rayleigh's experiments on the cohesion of liquid jets and drops, under slight electrical stimulus.
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