Used in photon counting for luminescence.

J.R. Prescott was an early researcher into photo-multiplier technology.

Securitainer UK PAT NO. 1246971 62 x 113 on Plastic Container. Grey plastic container contains glass cylinder with metal plates and rods/pins. EMI Electronics LTD VALVE DIVISION Drury Street Ruislir, Middlesex. Made in England

On silver label: EMI Type 6097B, S/No. 44346, Made in Great Britain.