Description of Photograph

Digital copy of a photograph of the LEO I racks with a diagram hanging up.

Caption:  'Some of the racks involved in the demo. They represented the main parts of the arithmetic unit.  Note the short one word delay tubes mounted on the racks.'

This image appears in the interactive plan for our Virtual LEO I installation, p61.

 

Research comments: The caption to this photograph relates to a demonstration of LEO (such as it existed at that point) to Lyons directors, managers and supervisors on 7/8th March 1950. The racks that are visible here represented the main part of the arithmetic unit.

Note the mounted three short mercury delay lines in the centre of the image. These short delay lines acted as buffers. Each is labelled; the top delay line is for the store, the middle one for the Accumulator I and the bottom one says Accumulator II.

Suspended over the right had rack is a large digram, possibly a wiring diagram. (LM)

Provenance
Digital copy made by John Daines, LEO Computers Society, of a photograph in the LEO Computers Collection (formerly part of the National Archive of Historic Computing) at the University of Manchester Library: NAHC/LEO/B1-13

Date: February 1950

Physical Description: 1 digital image (jpeg); black & white; image includes original typed caption

Archives Hub References: CMLEO/LS/PH/1/61852
NAHCB1-13

Other References: DCMLEO20210214014
                  
                  
                  
                  


Comment on This Photograph

This exhibit has a reference ID of CH61852. Please quote this reference ID in any communication with the Centre for Computing History.