Glass tube, cork and cotton at top and base to block an internal glass phyal containing whitish concretion. Labelled "Rubidium, Rb=85.4 Spgr 152". Rubidium c.1855
Rubidium photocell filled with gas (neon and helium), no.2903/1158, unsigned, Europe, 1901-1970. Rubidium photocell filled with gas (neon and helium) 1901-1970
