Assorted electric glassware

20th Century Electronics B12H Gieger-Müller tube, used for measuring radiation levels.

Mullard MX124 Gieger-Müller tube for liquid samples

Mullard IOG12 ionisation guage. Used to measure vacuum - the end is sealed onto the vacuum system, and the vacuum is measured using the electron flow from the filament to the other electrodes.

Sunco 'Sun-Vic' Vacuum switch contactors. Diagram on right is from 1936 Sunco catalogue.

More Sun-Vic pages from Sunco catalogue, listing types, prices etc.

Various vintage resistors ('Grid leaks')  and vacuum capacitors (condensers). Advertisment for Ediswan vacuum resistor

< STC K25/2L Vacuum capacitor (6½" x 2½" dia).

Measures 25 Picofarads, probably rated about 20KV.

> Cathodeon vacuum relay

Glass packaged quartz crystals

Weston voltage standard cells - these were used to provide a fixed 1.019 volt reference for calibrating voltmeters. Now obsoleted by semiconductor reference devices.

Array of 6 Weston cells in nice Perspex frame (made by Eppley Laboratory Inc, Newport R.I.) - anyone else think it looks like a bomb, or have I been watching too many action movies ? On second thoughts, maybe not - it hasn't got that oh-so-handy beeping countdown display!

Thermal time-delay relay, make unknown.