Type IB2 Geiger-Muller tube assembly with two spare shells showing construction Type IB2 Geiger-Muller tube assembly 1978-95
Geiger counter type M6H (Halogen Quenched) by 20th Century Electronics; gamma sensitive, used for medical applications (checking radioactivity in liquids) Geiger counter type M6H (Halogen Quenched) by 20th Century Electronics 1951-1978
Photomultiplier tube type VMP 11/44B by 20th Century Electronics Photomultiplier tube type VMP 11/44B 1960-1981
Model of photomultiplier and storage tube, built by apprentices and presented to the company director, Gilbert Tomes. Model of photomultiplier and storage tube 1960
One Cosmic Ray telescope employing Geiger counter tubes in coincidence. Comprising:(a) coincidence unit type 1036c, lent by Dynatron Radio Ltd, St Peter's Road, Furze Platt, Maidenhead, Berks (b) four Geiger-Muller tubes type G60H, gamma sensitive, presented by Twentieth Century Electronics Ltd, New Addington (c) two probe units type N558, lent by EKCO Electronics Ltd, EKCO Works, Southend-on-Sea, Essex cosmic ray telescope with geiger Counter tubes Coincidence Unit 1036C: 1957; Geiger-Muller tubes: 1956-1961; Probe Units Type N558: 1955-1961