Society of Glass Technology · [Sheffield] · leaf 722
eckstogether. The head carrying the nar-row portion makes an air-tight fit withthe top of the cup holding the outerportion, and as it comes into positiona valve is opened, withdrawing theair from the cup and the bottle-shaped outer vessel. At thesame time, a piston presses the two heated portions… … F». 214. 322 JOURNAL OF THE SOCIETY OF GLASS TECHNOLOGY, 417. Automatic Test-tube Making Machine. P. Born-kessel, Berlin (Brit. Pat., No. 177884, January 7th, 1921).—Relates to automatic apparatus for making two glass tubes, withone end closed, such as test-tubes, from a single open-ended…
Glass
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