Home > LEO Computers > Lyons Electronic Office (LEO) Archive > CMLEO/PB - Peter Bird Collection > CMLEO/PB/PH Photographs > Photographs of LEO II > 60878 Ferranti Magnetic Drum type 1009

60878 Ferranti Magnetic Drum type 1009

Description of Photograph

Photograph of the Ferranti magnetic drum type 1009 used on LEO II.  Peter Bird wrote a detailed caption on the reverse of the print:

128 tracks each 1mm wide. The surface is divided into four quadrants each 90 degrees. Each track is divided by the quadrants into four sectors. Each sector is a location on the drum surface where one block of information was stored. One block was equal to one 'tube full' of information as held in main store. Four drums could be attached. Speed of drum was 4,500 rpm. Four drums was equal to 32 times the capacity of main store.

Published in Bird, Peter LEO - The First Business Computer (Wokingham: Hasler, 1994), plate 38.


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

Date: c1959

Physical Description: 2 photographic prints (1 duplicate); black and white

Archives Hub References: CMLEO/PB/PH/2/60878

Other References: DCMLEO20190607006

Comment on This Photograph

This exhibit has a reference ID of CH60878. Please quote this reference ID in any communication with the Centre for Computing History.

Photograph of 60878  Ferranti Magnetic Drum type 1009

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