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Peltier Type Electrometer, 1848

1845

Kelvin Quadrant Electrometer, 1866

1866

Hibberts magnetic Standard no. 9, 100 turns, c.1900.

Hibberts magnetic Standard no. 9

1890-1910

5KV Ionisation Tester type 732 by Airmec Laboratories Ltd., High Wycombe, Bucks, serial no. 1639, c. 1980

5KV Ionisation Tester type 732 by Airmec Laboratories Ltd.

1971-1990

Precision ratio comparison bridge type VLF51A, by Rosemount Engineering Company Limited, Bognor Regis, Sussex, England, c.1980, with terminal unit model CSU A1.

Precision ratio comparison bridge type VLF51A

1976-1985

Ayrton and Perry's fixed coil moving needle non-commutator ammeter

Ayrton and Perry ammeter, about 1880

1875-1884