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61848 Experimental delay tube on the workshop bench (1949)

Description of Photograph

Digital copy of a photograph taken in one of the workshops (St Mary's College) at Cadby Hall where LEO I was developed prior to installation in WX block.  An experimental version of a mercury delay tube is visible on the bench.

Published in Bird, Peter  LEO - The First Business Computer  (Wokingham: Hasler, 1994), plate 15.

Caption:  'Also in St Mary's College experimental delay tube on the bench. 1949'


Research comments: Lyons purchased the St Mary's College campus in Brook Green, Hammersmith in 1922, as it adjoined Cadby Hall. They began using the building in 1925, once the college had relocated.

This photograph is very early in the development of LEO I. Delay tubes were filled with mercury and were used a form of sequential access storage or memory. (LM)

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/B1-03

Date: 1949

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

Archives Hub References: CMLEO/LS/PH/1/61848

Other References: DCMLEO20210214003
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Comment on This Photograph

This exhibit has a reference ID of CH61848. Please quote this reference ID in any communication with the Centre for Computing History.

Photograph of 61848  Experimental delay tube on the workshop bench  (1949)

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