Inside Out Library
Journal (1917)
Society of Glass Technology · [Sheffield] · leaf 463
r by opening J and applying gentle suction at i\The air current was provided by the rubber bulb, B, worked by handand driving a stream of small bubbles through the septum, C.A froth an inch in height was maintained in D, and as often as wasdesirable, by blowing slightly harder, portions are blown… … E- —^ s f> ©ji IP / ]J I IG. 8.Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
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