B&W, Perspective view, "T" bracket and base with vertical cylinder, with knurled knob atop cylinder. a scale with inches (0 to 6) at bottom. A white square block at bottom right with a knurled knob above, a knurled cylindrical member below and a cylindrical platform with a fence and wires. Flat white background, grey shadow of unit. Verso : National Physical Laboratory red ink stamped label on verso right upper edge; "CROWN COPYRIGHT RESERVED, NATIONAL PHYSICAL LABORATORY., TEDDINGTON MIDDX.,CENTRAL PHOTOGRAPHIC SECTION, Negative No. CS/1827".; black ballpoint handwritten center "Pilot Model Adjustable Length Short Delay Line Storing 1 Word of 32 Binary Digits. (circulation time 32us)." ; "281" in black pencil on center top edge.
Identification photograph; Publicity photograph
Computers--History; Electronic data processing--History; Computer industry--History