Friend, J. Newton (John Newton), 1881-1966 · London, New York : Longmans, Greens · leaf 202
180 INTRODUCTION TO CHEMISTRY OF PAINTS London gum-pots have a flat bottom, but those in the North of England are conical in shape, which latter device enables the gum-runner to ascer¬ … hole in the top of the furnace, which Fig. 17. top forms the floor of the gum¬ running shed. During the process of fusion acrid vapours escape from the resins, and are carried by means of a hood into a chimney. The operation is expensive, for the resins are often costly, and lose from 5 to 20 per…
Paint · Chemistry, Technical
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