Telephone lineman's thermometer made by the Thompson Manufacturing Co. Ltd
1938
Direct reading pH meter
1950-1970
Richmond vs Oxford University rugby match
1960s
A Catalogue of the Apparatus of Philosophical Instruments
1701-1800
Two parts of Beckley recording rain gauge
1868
Photoheliograph of the Sun
1861
Photoheliograph of the Sun
1858-1861
Photoheliograph of the Sun
1861
Sample book containing skeins of viscose yarn
1900-1935
Spear glass pH electrode
1960-1970
Daily Herald Photograph: Parkleys estate
1962-04-21
Photoheliograph of the Sun
1861
Photoheliograph of the Sun
1861
Glass pH electrode
1960-1970
pH electrode for high temperatures (serial no. 1027/900). E.I.L.
Vibron electrometer
Industrial pH transmitter
1950
Portable pH meter
1979
KCl reservoir
pH calibration unit model 77 (serial no. 7763) mounted in wooden carrying box. E.I.L.
pH controller (ON/OFF) model 92A
pH controller model 90A (serial no. 922 98A). E.I.L.
pH controller model 91B. E.I.L., Richmond, Surrey
Direct reading pH meter
1947-1960
pH meter model 7010. E.I.L., Richmond, Surrey
Constantan resistance box
Direct reading fluorimeter
Vibron laboratory electrometer converter unit
Chronotron demonstration unit in wooden carrying box. E.I.L.
Milliohmmeter model 47A. (L serial no. 1624603) E.I.L.
Portable electrometer model 37C (serial no. 37161C). E.I.L.
Switching unit
Gammagraph, model 65A. E.I.L.
Vibron electrometer model 33B (serial no. 33713). E.I.L.
Dip electrode system for monitoring pH
Two all purpose industrial glass electrodes
Thermostatic control unit
Portable pH meter
Electrode switching unit
Vibret laboratory pH meter (serial no.466 64A). E.I.L.
pH meter model 7020. E.I.L., Richmond, Surrey
pH controller (two-term) model 92C (serial no. 92 362C). E.I.L.
Direct reading pH meter
pH meter
Measuring unit
Vibron blood pH meter
Wigan constant resistance divider
Microvac electronic test meter model 22D (serial no. 22706). E.I.L.
Vibron electrometer model 33C-2 (serial no. 334251C). E.I.L.
