Artifact Details

Description

Black and white image 5 vacuum tubes (valves) and a socket with a ruller in the middle to show scale. Identification dataprinted on the image:
"THE VALVES USED IN COLOSSUS 1. The photograph below shows the four valves and the photo-electric cell which were most commonly used throughout Colossus. They are ( left to right) EF 36 - GTIC - 807 -L63 - Photo-cell 'RCA' 2. In the foreground is the surface mounting ocatal valveholder used extensively throughout the machine. " Verso : Copyright Enquiries to The Science Museum"

Publisher

The London Science Museum

Place of Publication

London

Identifying Numbers

Other number	#698	Verso pencil
Other number	1818/75	Verso pencil

Dimensions

overall: 9 1/4 in x 7 1/2 in

Category

Photograph

Credit

Courtesy of Gwen Bell

Lot Number

X7413.2015