B&W, Ace Pilot Model 1950 magnetic Drum, perspective view. Laboratory environment, black background to the left; white block wall to the right. Hardware sitting on a black platform. Sign on back, black background/hood "Solenoids, READ, WRITE". "278" black pencil on verso top, right of center edge. Label, black printed ink (dot matrix) on verso lower right; "CS4813, CROWN COPYRIGHT, CENTRAL PHOTOGRAPHIC SECTION, NATIONAL PHYSICAL LABORATORY, TEDDINGTON MIDDX". Loose strip of paper accompanying photo - "CS4813 A magnetic drum of the ACE Pilot Model with 16 read and 16 write heads, each shiftable to 16 positions, giving 256 tracks each holding 1024 bits in the contents of a delay line. Its rotation was synchronised to the delay line clocks at 1/9 of their speed, thus the sequence of storage of bits was 1, 10, 19 ..... modulo 1024.".
Identification photograph; Publicity photograph
Electronic data processing--History; Computer industry--History; Computers--History