Society of Glass Technology · [Sheffield] · leaf 620
Sac., 1920, 42, 786).—The authoradvocated the use of a, hook-shaped trap(Fig. 117) to prevent access of air ormoisture to the: vacuous space owing tomovements of the mercury during changesof pressure, and also- to prevent the break-ing of the sealed end of the tube by theimpact of mercury when air… … Fig. 117. 192. A Valve for Glass Apparatus. K. Bunge (Chem.Zeitimg, 1920, 44, 299).—A valve which could be used on burettesor on pipettes to prevent the entry of liquid into the operatorsmouth was described. A glass tube, melted solid at one point, hadon either sidei of the solid portion two small…
Glass
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