The Tube Map Is a Circuit Diagram

Harry Beck was a 29-year-old engineering draughtsman in the London Underground's Signals Office when he was laid off in 1931. He spent the gap drawing what he knew best. At the Signals Office his job had been wiring diagrams — boxes, lines, junctions, no scale. Geography was not the point of a circuit diagram; legibility was.

He applied the same logic to the Tube. London's earlier Underground maps had tried to overlay the network on a real street grid, which left the central stations stacked on top of each other and the suburban branches pulled out into thin twigs. Beck threw out scale entirely. He kept only horizontals, verticals, and 45-degree diagonals; spaced the stations more or less evenly; colored each line; and let the Thames stay as a soft blue ribbon to anchor the geography that remained.

Frank Pick, the publicity manager who had built the Underground's design identity, looked at the first version and turned it down — too radical, distances were lying. A year later, with a new draft in hand, Pick agreed to a tentative trial: 500 pocket cards in 1932. The cards moved. In January 1933 the Underground printed 700,000 copies and the diagrammatic map was permanent.

Beck got something in the neighborhood of five guineas — accounts from the London Transport Museum and English Heritage put the figure between five and ten — and the right to keep refining it, which he did, almost obsessively, until 1959. Today every printed Tube map carries a small line in the corner: This diagram is an evolution of the original design conceived in 1931 by Harry Beck. The diagram has outlasted the typewriters, the paper, and most of the lines on it.