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61191 LEO I racks (1954)
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Description of Photograph Photograph of the 21 LEO I racks, fully populated with covers off. The extra rack on the right hand side dates the image as being later on in the development process. This image is almost identical to 61190 (ALK/13/15), most likely taken on the same occasion.
Research comments: The thousands of glass valves used in LEO I, and the complex web of wires used to connect them, can clearly be seen in this photograph. The racks had bright blue covers on them, which could be lifted off to access the valves. Further wiring exists underneath the false wooden floor. Above the racks, the ventilation ducting can be seen (the computer gave off an enormous amount of heat). The heat was vented out of the window. (LM) Provenance Date: 1954 Physical Description: 1 photographic print; black and white Archives Hub References: CMLEO/LS/PH/1/61191 ALK/13/03 Other References: DCMLEO20190329012 Comment on This Photograph This exhibit has a reference ID of CH61191. Please quote this reference ID in any communication with the Centre for Computing History. 
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