Vacuum tube with 5 bulbs and enclosed spirals, length 3ft 6ins Vacuum tube with 5 bulbs and enclosed spirals
Hygrometer, consisting of two thermometers on brass stand. The stem of the wet bulb is bent and has a large bulb covered with muslin. One thermometer is broken. Hygrometer, consisting of two thermometers on brass stand 1876
Dry and Wet bulb thermometers. On Brass stand, by Geissler, 1876. Dry and Wet bulb thermometers. On Brass stand 1876
Geissler filter pump, by Baird and Tatlock (London) Limited, London, England 1917-1927 Geissler filter pump 1917-1927