CHM Revolution

Photographer

Richards, Mark

Dimensions

overall: 6 in x 6 in x 18 in

Manufacturer

LEO Computers Ltd.

Credit Line

Purchase of the Computer History Museum

Copyright Owner

© Mark Richards

Object ID

102716094

Speed

340µs/add

Memory Type

Mercury delay line

Memory Size

1024 words

Memory Width

39-bit

Cost

$250,000 (£90,000/1958)

Operators used these displays to monitor the computer’s operation. This tube is from the third LEO II built (one of the first installed outside of Lyons). The computer was used by prominent British steelmaker Stewart & Lloyds for payroll processing.