Home > LEO Computers > Lyons Electronic Office (LEO) Archive > CMLEO/LS - LEO Comput ... s Society Collection > Photographs > Photographs of LEO I > 61299 LEO I racks wi ... embled (10 June 1950)

61299 LEO I racks with exhaust trunking assembled (10 June 1950)

Description of Photograph

Photograph of the LEO I racks with part of the cooling ducts installed.  According to Peter Bird's published caption, this was the first photograph of the LEO I computer shown to the Lyons directors, and was submitted with Report no 7 to the Board by John Simmons on 3 Jul 1950.

Published in Bird, Peter  LEO - The First Business Computer  (Wokingham: Hasler, 1994), plate 21.

This image appears in the interactive plan for our Virtual LEO I installation, p8.

The caption written on the back of the print is in LEO historian Peter Bird's handwriting, indicating it was originally from his collection but was at some point separated from the rest before being given to the archive.


Research comments: A view of LEO I racks under construction. The valves inside the racks can be clearly seen. The ventilation system is also clearly shown, which draws off surplus heat through the tops of the racks and then out of a nearby window. Only three rows of racks are present at this point, the nearest row (and floor) has yet to be built. Eventually, there are 21 racks in total.

The photo is believed to have been taken on 20th June 1950. The windows in this picture face out onto the street (Blythe Road, Hammersmith). (CM/LM)

Transferred to the LEO Computers Society archive by LCS Chair, Peter Byford.

Date: 10th June 1950

Physical Description: 1 photographic print; black and white

Archives Hub References: CMLEO/LS/PH/1/61299
CCH LI 09.30

Other References: DCMLEO20191220024
Related Topics:

Comment on This Photograph

This exhibit has a reference ID of CH61299. Please quote this reference ID in any communication with the Centre for Computing History.

Photograph of 61299  LEO I racks with exhaust trunking assembled (10 June 1950)

Copyright Unknown

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