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61855 LEO I Storage Unit (1950)
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Description of Photograph Digital copy of a photograph of a LEO I storage unit attached to a short delay line. Caption: 'A storage unit for recycling pulses with 1 word delay line. [ms] 20/6/50' This image appears in the interactive plan for our Virtual LEO I installation, p64.
Research comments: The short delay lines acted as buffers. Each storage unit had 25 thermionic valves. In total LEO had almost 6,000 valves with another 300-400 in the auxiliary equipment. Most of the valves were common types found in televisions and radios at the time, but others were more specialised. Often Lyons purchased ex war department valve stocks. (LM) Provenance Date: 20th June 1950 Physical Description: 1 digital image (jpeg); black & white; 1 digital image (jpeg); black & white Archives Hub References: CMLEO/LS/PH/1/61855 NAHCB1-18 Other References: DCMLEO20210214017 Comment on This Photograph This exhibit has a reference ID of CH61855. Please quote this reference ID in any communication with the Centre for Computing History. 
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