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60491 Ernest Lenaerts, Ray Shaw and Ernest Kaye set up for the LEO I Demonstration

Description of Photograph

Photograph of three of the LEO I team preparing for the demonstration to Lyons board members on 8 Mar 1950. Lenaerts is at the blackboard, presumably chalking up the Payroll job which is visible on the board in CMLEO/PB/PH/1/55715.

The 'Accumulator Store', next to which Ray Shaw sits, has been draped in black cloth, perhaps to concentrate the eye on the scopes.

Research comments: This photograph shows preparation for an early demonstration of LEO I which takes place long before the machine is finished. The area around LEO is clearly still being developed and LEO's racks are incomplete. The 'Accumulator Store', complete with black draping, can be more clearly seen in another photograph taken the same day. Lenaerts, Kaye and Shaw are key members of the development team. The LEO Chronicle entry for 8th March 1950 states that "Demonstrations are given to Directors, Office Managers and Supervisors, and representatives of the Clerical Staff Committee of the way counting and addition are carried out by the calculator." The team provide support notes that include an explanation of binary. (LM)

Collected by Peter Bird as part of his research for his book LEO - The First Business Computer (1994).

Date: 8th March 1950

Physical Description: 1 photographic print; black and white

Archives Hub References: CMLEO/PB/PH/1/60491

Other References: DCMLEO20190510022
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Comment on This Photograph

This exhibit has a reference ID of CH60491. Please quote this reference ID in any communication with the Centre for Computing History.

Photograph of 60491 Ernest Lenaerts, Ray Shaw and Ernest Kaye set up for the LEO I Demonstration

Lyons copyright

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