Experimental secondary emission tube

1945-48

Geiger-Muller tube

1949

Early 8-pin photocell

1946-48

Early 'Maze' type Geiger-Muller tube

1948-50

Early type HC4 Geiger-Muller tube

1946-48

Type M6 Geiger-Muller tube

1946-48

Early electron multiplier

1946-1948

Early electron multiplier

1946-1948

Early Mk 1 anti-coincidence counter

1946-48

Early projection cathode ray tube

1946-53

Early version of type M6M Geiger-Muller tube

1946-53

Early copper mesh cathode Geiger-Muller tube

1946-50

Early type GM5 copper cathode Geiger-Muller tube

1940-43

Early type SW12 side-window Geiger-Muller tube

1946-53

Early electron multiplier

1946-1948

Early electron multiplier

1946-1948

Early electron multiplier

1946-1948

Early electron multiplier

1946-1948

Early electron multiplier

1946-1948

Early electron multiplier

1946-1948

Early Mk 2 anti-coincidence counter

1946-48

Early brass side-window radiation detector

1946-48

Early cathode ray tube

1948-53

Early type TR photocell

1946-48

8 early electron multipliers

1946-1948