History of Science Museum: Collection Database Search

Narratives

Inventory no. 26432 - Former Display Label

English BRAUN NEEDLE ELECTROMETER
c.1920

Iron case with circular glass plates and zinc covers with slit for electrometer scale. Curved scale, reading directly from 0-3, 500 volts in 100 volts divisions. Aluminium needle swings on hardened points in slit of strip connected to terminal on top of casing. Centre of gravity of needle very closely below arc of rotation. Braun's instrument designed in 1887 is almost as sensitive as the gold-leaf electroscope. Instruments of this type made in the range from 0 to 10,000 volts; much used in lecture demonstrations.
Transferred from the Physical Chemistry Laboratory, Oxford

[64-284]

Other narratives:

Related Objects: