A glass sphere, about 8.5cm in diameter, with four short glass projections, each holding an electrode. A glass bulb is mounted with curved glass stem…
A black turned wooden base with a 19cm glass tube vertically mounting on top of the wooden base. On the lower part of the glass…
A turned black wooden base with a 16cm glass tube mounted on top of it. There is a semicylindrical electrode positioned vertically at the bottom…
A five-mineral fluorescing cathode ray tube or Crookes tube consisting of a par-shaped upright glass bulb mounted above a turned wooden base. Within the bulb,…
A black turned wooden base with a 17cm glass tube mounted vertically onto the wooden base. There is a curved electrode plate on the bottom…
A long cylindrical glass bulb mounted vertically on top of turned wooden base. The top and bottom of bulb have disc-shaped electrodes. In the middle…
A 20 cm glass bulb with two 3 cm projections on opposite sides. The glass bulb contains three electrodes. A 6 cm tube is mounted…
This is a black instrument which stands on three adjustable screw legs with plastic feet. The instrument is cylindrical, with an broader round base. On…
This is a black instrument which stands on three adjustable screw legs with plastic feet. The instrument is cylindrical, with an broader round base. On…
This is a black instrument which stands on three adjustable screw legs with plastic feet. The instrument is cylindrical, with an broader round base. On…