According to The Curious Barista’s Guide to Coffee, it allowed users to up-end the whole cylinder to empty it, and also featured an “examiner” that allowed samples to be taken throughout the roast. Richard Evans patented the first large-scale coffee roaster in the UK in 1824. But this gave the coffee a smoky flavour, so when natural gas became available, it soon became the roaster’s preferred heat source. Until the introduction of gas supplies throughout urban centres, wood or coal was used. Many early industrial roasters were simply large cylinders placed over a heat source. In the 19th century, various patents were awarded in the US and Europe for commercial machines, although many people continued to roast their own small batches at home. Coffee roasting was no exception to industrialisation.
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