CHM Revolution

Date Introduced

1945

Photographer

Richards, Mark

Dimensions

8 1/2 x 8 1/2 x 1 in.

Manufacturer

Post Office Research Station, Bletchley Park

Credit Line

Gift of Toby Harper

Copyright Owner

© Mark Richards

Object ID

X49.82

Speed

5,000 characters/s

Memory Width

5-bit

This is one of few surviving pieces of the Colossus machines used at Britain’s Bletchley Park to break German Lorenz codes during WWII. Winston Churchill acknowledged that they shortened the war, but ordered the machines destroyed and kept secret.