In typography, a slab serif (also called mechanistic, square serif, antique or Egyptian) typeface is a type of serif typeface characterized by thick, block-like serifs. Serif terminals may be either blunt and angular (Rockwell), or rounded (Courier). Slab serifs were introduced in the early nineteenth century.
Slab serifs form a large and varied genre. Some such as Memphis and Rockwell have a geometric design with minimal variation in stroke width: they are sometimes described as sans-serif fonts with added serifs. Others such as those of the Clarendon genre have a structure more like most other serif fonts, though with larger and more obvious serifs. These designs may have bracketed serifs which increase width along their length before merging with the main strokes of the letters, while on geometrics the serifs have a constant width.
Display-oriented slab serifs are often extremely bold, intended to grab the reader's attention on a poster, while slab serifs oriented towards legibility at small sizes show less extreme characteristics. Some fonts oriented towards small print use and printing on poor-quality newsprint paper may have slab serifs to increase legibility, while their other features are closer to conventional book type fonts.
Slab serif fonts were also often used in typewriters, most famously Courier, and this tradition has meant many Monospaced font text fonts intended for computer and programming use are slab serif designs.
The first known example of a slab-serif letterform is woodblock lettering on an 1810 lottery advertisement from London. Slab-serif type was perhaps first introduced by London typefounder Vincent Figgins under the name "Antique", appearing in a type-specimen dated 1815 (but probably issued in 1817).James Mosley, The Nymph and the Grot: the revival of the sanserif letter. London: Friends of the St Bride Printing Library, 1999.
Writing in 1825, the printer Thomas Curson Hansard wrote with amusement that slab-serif and other such display types were 'the outrageous kind of face only adapted for placards, posting-bills, invitations to the wheel of Fortune...Fashion and Fancy commonly frolic from one extreme to another.'
Slab serifs declined following the growing popularity of sans-serif faces, with which they always competed. Notable collections of original wood type are held by the Hamilton in Wisconsin Hamilton Wood Type and Printing Museum Analog, digital, virtual: @Home with Hamilton Wood Type by Molly Doane and the University of Texas at Austin, collected by Rob Roy Kelly, writer of a well-known book on American poster types. Adobe Inc. has published a large collection of digitisations inspired by nineteenth-century wood type. Bringing Wood Type into the 21st Century by Angela Riechers Hamilton Wood Type Collection – joint venture between P22 Type Foundry and the Hamilton Wood Type and Printing Museum Wood Type Revival – created from hand-set letterpress prints of the original 19th century wood type by Matt Griffin & Matt Braun Etna – typeface adapted by Mark Simonson from HWT Aetna
Following Napoleon Egyptian campaign and dissemination of images and descriptions via publications like Description de l'Égypte (1809) an intense cultural fascination with all things Egyptian followed. Suites of contemporary parlor furniture were produced resembling furniture found in tombs. Multicolored woodblock printed wallpaper could make a dining room in Edinburgh or Chicago feel like Luxor. While there was no relationship between Egyptian writing systems and slab serif types, either shrewd marketing or honest confusion led to slab serifs often being called Egyptians.Carter, E., Day. B, Meggs P.: "Typographic Design: Form and Communication, Third Edition", page 35. John Wiley & Sons, 2002. Historian James Mosley has shown that the first typefaces and letters called 'Egyptian' were apparently all sans-serifs.
The term Egyptian was adopted by French and German foundries, where it became Egyptienne. A lighter style of slab serif with a single width of strokes was called 'engravers face' since it resembled the monoline structure of metal engravings. The term 'slab-serif' itself is relatively recent, possibly twentieth-century.
Because of the clear, bold nature of the large serifs, designs with some slab serif characteristics are also often used for small print, for example in printing with typewriters and on newsprint paper. For example, Linotype's Legibility Group, in which most newspapers were printed during much of the twentieth century, were based on the "Ionic" or "Clarendon" style adapted for continuous body text.
More loosely, Joanna, TheSerif, FF Meta and Guardian Egyptian are other examples of newspaper and small print-orientated typefaces that have regular, monoline serifs (sometimes more visible in bold weights) but a general humanist text face structure not particularly influenced by nineteenth-century stylings (as Clarendons are). The term "humanist slab serif" has been applied to serif text faces in this style.
Describing the process of designing slab serifs, modern font designers Jonathan Hoefler and Tobias Frere-Jones note that the structure of the large slab serifs imposes compromises on structure, with purely geometric designs harder to create in ultra-bold sizes where it becomes impossible to create a strictly monoline lower-case alphabet, and Clarendon-style designs harder to create in a lighter style.
A considerable variety of other names have been used, particularly in the 19th century: at the time the separation between typeface name and genre had yet to become established, so it is not clear if a name describes a specific typeface or is meant to refer to a subgenre. Type classifications are useful, but the common ones are not by Indra Kupferschmid For example, slab serifs on the French Clarendon model were also called 'Celtic', 'Belgian', 'Aldine' and 'Teutonic' by American printers, as well as 'Tuscan', a name which refers to slab serifs with diamond-shaped points, called median spurs, on the sides of the letterform.
Some monoline slab serifs such as Serifa, Helvetica and Roboto Slab have been designed under the influence of neo-grotesque sans-serif fonts of the 1950s and 60s onwards, and these may be called "neo-grotesque" slab serifs.
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