Standard layout of the "Registered Design" version of the Johnston Underground roundel - roundel drawing

This is the earliest drawing of a 'standard' roundel design. It follows the 1919 version of the roundel symbol created by Edward Johnston. The diagram shows Johnston's design guidelines for the roundel, including the exact proportions, measurements and colours to be used with the 'pecked' Underground lettering. At the bottom are the registered design numbers for two variations of the sign. The symbol was also known as the 'bull's-eye' design.
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Transport for London

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