r impregnation the mantles are passed through mantles, being mere gossamer tissues of ash, were ex- a wringing machine composed, essentially, of two roll- in large chambers heated to 122 deg. P., where they ceedingly fragile. In recent years many attempts have ers covered with ebonite and soft… … Fig. 1.—Impregnating the mantles with collodion. Fig. 2.—Wringing the mantles to remove the excess Solution. THE MANUFACTURE OF INCANDESCENT GAS MANTLES. incandescent mantles, in order to diminish their fra- to give any desired clearance by means of a system of From this stage onward the…
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