21 March – 21 June 2016 in Florence, Rome, Naples, Palermo, Padua


H. Geissler, Berlin (Germany), 1882

Glass, metal;
Length 250 and 185 mm

INAF – Palermo Astronomical Observatory

These twelve glass tubes, having different lengths and sections, were purchased by the Palermo Observatory in January 1882.
They are common Geissler tubes, used to study electrical discharges in gases at very low pressure. Some tubes are devoid of the metal contacts at both ends, of the almost unreadable labels on which are indicated, in German, the chemicals in question, such as Sauerstoff, Kohlensäure, Zinkchlorid, Stickstoff.
From the third quarter of the 19th century until 1930, Geissler tubes were produced by various glassblowers such as Franz Müller (Geissler’s Nachfolger), Greiner & Friedrichs, Rudolf Pressler and others. [i.c.]

Bibl.: Foderà Serio, Chinnici 1997, pp. 132-33.