Browse Items (3473 total)

One of two tubes have a spiral glass feature; presumed to have been acquired as a set with five others

Small brass telescope. Part of something.

Provides approx. 1200 Volts at a few hundred Amps . One of the largest vacuum tubes. Pool of mercury in the base acts as a cathode, feeding the 3 side-arm anodes, one for each phase of a 3-phase supply. Three intermediate grids provide some control…

User's manual for ABDNP201456a including operating instructions, circuit diagram and supplementary booklets for keyboard and mouse. In original cardboard case.

arch shaped stand with a copper disc and a bar magnet suspended from the top

Glass jar with wooden lid; lid handle extends through to bottom of lid with chain attached which hangs into jar. Jar is painted in conducting material.

Has 3 interwound coils forming a vertical loop in the centre of which lies a magnetic pointer and dial on a circular horizontal wooden table. All are mounted on an ebonite pedestal with three brass adjustable feet. Six terminals are joined in pairs…

Said to be attached to model of levers but not present

Glass density bottle; etched onto bottle '25 Grammes, 60 F'; in custom-made black-painted tin; packed in cotton wool

Selenium rectifier with black cooling fins. Every fourth sheet has a hole in one corner while all other corners have been taken off. The central rod has screw terminals at either end.