to remember midity had risen to 75 per cent. At 1:10 the opera- orating surface provided in the nest of cylinders, com- bined with the large volume of air which is drawn some chemical data. tion of the machine was reversed, and the process of through the cylinders by the fan. The air, with its A… … phuric acid. The gas is evolved, and the formation of the orange sulphide of antimony and black sulphide A CHEMICAL THICK. of lead takes place in a few seconds. feed water being passed into the machine at 67 THE ART OF INVENTING. deg., and the feed of air being drawn from the in- BY EDWIN J.…
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