Glass cup form with platinum electrodes in stem with connecting wires connected to two two terminals fitted on wooden base with two graduated test table and holder to support them.

Two copper plates, size 120 x 50 mm, each fitted with a terminal on wooden support. Complete with glass jar, 150 x 100 mm. ht x diam.

With two outer 75 x 50 mm and a central 70 x 45 mm copper plates, suspended from copper wires fitted with 4 mm connectors and supported by two insulated bars. With glass jar, 150 x 100 mm.

Borosilicate glass, concave, fire polished edge.