| 摘要 |
two parallel tube sections for holding a quantity of Hg vapour, the sections are exposed to the atmosphere; seals for one end of each tube section; stems disposed at each sealed end, at least one including a receptacle disposed partially outside the tube sections; means for sealing and connecting the other ends of the tubes in pairs, the connecting tube having a smaller dia. than the tubes it connects; an amalgam is contained in the exterior portion of the receptacle for maintaining discharge luminance at a constant valve. Pref. (i) the connecting tube is U-shaped having the min. dia. at the mid point, (ii) the amalgam is In-Bi including 0.75-6 wt.% Hg.
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