Features
The capitals of the typeface are based on Roman square capitals such as those on the Column of Trajan, and the lower-case on traditional serif fonts. Johnston greatly admired Roman capitals, writing that they "held the supreme place among letters for readableness and beauty. They are the best forms for the grandest and most important inscriptions." Justin Howes, author of the leading work on the Johnston Sans design, Johnston's Underground Type, has highlighted the similarity of the design to the eighteenth-century Caslon type designed by William Caslon in particular, noting that Johnston had worked on a book printed using this typeface shortly before starting work on his design and reproduced their structure in a textbook.[5]
Johnston's alphabet marked a break with the kinds of sans serif then popular, now normally known as grotesques, which tended to have squarer shapes inspired by signwriting and Didone type of the period. Some aspects of the alphabet are geometric: the letter O is a nearly perfect circle and the 'M', unlike Roman capitals (but like Caslon) straight-sided.[6] As with most serif fonts, the 'g' is a 'two-storey' design. The 'l' copies the curl of the 't' and produces a rather wide letter compared to most sans-serif fonts. The lower case i and j have diagonally placed square dots or tittles, a motif that in some digitisations is repeated in the full stop, commas, apostrophes and other punctuation marks.
Johnston's design process considered a variety of eccentricities, such as a capital-form 'q' in the lower-case and a single-storey 'a' like that later seen on Futura, before ultimately discarding them in favour of a clean, simplified design.[7][8] However, many early versions of Johnston's "alphabet" included a Garamond-style W formed of two crossed 'V's, and some early renderings as hand-lettering showed variation.
Unlike many sans-serifs of the period, Johnston's design (while not slender) is not particularly bold. Gill would later write of his admiration for how Johnston had "redeemed" the sans-serif from its "nineteenth-century corruption" of extreme boldness.[7][9]
As an alphabet intended for signage, Johnston was designed without any italics. Any italic design seen is therefore an invention of a later designer, intended to match Johnston's design. Different designers have chosen different approaches to achieve this: some offering a 'true' italic, others an oblique in which the letters are simply slanted, and some declining to offer one, perhaps concluding that an italic is inappropriate to the purpose of the original design.[10][11] An official version of the typeface in italics was commissioned by London Transport from Berthold Wolpe in 1973.[12]