Constant Voltage Transformer
1940-1969
High frequency turret attenuator unit type A63
1957
Large 2-hour sand-glass by Henry Hughes & Son Ltd.
1931
Audio frequency sine/square wave signal generator type E1 sertrs no. 4219
1940-1950
Oscilloscope type OS12 serial no.1639 made by Advance Electronics Ltd.
1969-1974