mackintosh

The mackintosh takes its name from Charles Macintosh (1766–1843), a Scottish chemist born in Glasgow, the son of a textile manufacturer. Macintosh spent much of his career working on practical applications of chemistry for industry, and in 1823 he patented a method for waterproofing fabric by dissolving naphtha-derived rubber in coal-tar naphtha and spreading the resulting solution between two layers of cloth, cementing them together. The resulting laminated fabric repelled water entirely. Macintosh's manufacturing partner, the clothing firm Chas. Macintosh & Co. in Manchester, began producing coats from the material in the same year, and the garments were immediately popular with anyone who had to work outdoors in wet weather. Sailors, soldiers, shepherds, and anyone who spent time in the British climate found them indispensable. The coat took the chemist's name — with a spelling variant (the double-t 'mackintosh' appeared in popular usage) that stuck faster than the correct single-t form.

The early mackintosh had significant drawbacks that any honest account must include. The rubber cement that bonded its layers emitted an unpleasant smell, particularly in warm weather. In cold weather, the rubber became stiff and brittle, restricting movement. In hot weather, it softened and became tacky, and could melt if left near heat. The garment's internal heat retention made it an uncomfortable oven in anything other than cool rainy conditions — exactly the conditions in which it worked best. These limitations were only partially resolved when Charles Goodyear's vulcanization process (1839) made rubber more temperature-stable, and Goodyear licensed the process to Thomas Hancock in Britain, who had already been producing and improving the Macintosh coat. The mackintosh that emerged after vulcanization was a considerably more practical garment, and its military adoption during the Crimean War (1853–1856) confirmed its utility under field conditions.

The mackintosh became entangled with British identity in ways that go beyond mere utility. The wet climate of the British Isles, the Victorian and Edwardian emphasis on outdoor activity regardless of weather, and the garment's association with detective fiction — Sherlock Holmes's deerstalker is famous but his mackintosh less so; the trench coat, a descendant of the mackintosh, became the standard fictional detective's garment — gave it a cultural weight beyond any raincoat's practical function. By the late nineteenth century, 'mac' was common slang for any waterproof coat, and the Mackintosh was the default garment of respectable outdoor wear. The British relationship with rain, which is not a crisis but a condition, needed a garment that treated precipitation as a management problem rather than an emergency, and the mac provided exactly that.

The word 'mackintosh' has had a curious second life in computing: Apple's Macintosh computer, introduced in 1984, was named by Jef Raskin after the McIntosh apple variety (a different spelling, from John McIntosh, the Ontario farmer who cultivated the variety in the early nineteenth century). The spelling overlap between the rain-coated Macintosh and the apple-named Macintosh is a coincidence — they descend from different Scottish surnames — but it has created a persistent folk-etymological confusion. In any case, the chemist's coat has given English one of its most durable clothing terms: 'mac' as shorthand for any waterproof jacket, whether made of Macintosh's rubber cement or modern Gore-Tex, is standard British usage.