Porter (beer)

Porter was first mentioned in 1721, as a development of the brown beer already being produced across London, and delivered to publicans to age and blend to their customers tastes.[8] The innovation is attributed to Ralph Harwood, a brewer at the Bell Brewhouse in Shoreditch.[2][9][10]

Before 1700, London brewers sent out their beer very young, as Milds; any ageing into Stale styles, was either performed by the publican or a dealer, with blends of Milds and Stales often sold to the public.[8] Porter was one of the first beer styles to be aged at the brewery and dispatched in a condition fit to be drunk immediately. It was also a style that could be made on a large scale, and the London porter brewers, such as Whitbread, Truman, Parsons and Thrale, achieved economies of scale, and financial success.[11]

Early London porters were strong beers by modern standards. Early trials with the hydrometer in the 1770s recorded porter as having an original gravity (OG) of 1.071 and 6.6% alcohol by volume (ABV).[12] Increased taxation during the Napoleonic Wars pushed its gravity down to around 1.055, where it remained for the rest of the 19th century. The popularity of the style prompted brewers to produce porters in a wide variety of strengths. These started with Single Stout Porter around 1.066, Double Stout Porter (such as Guinness) at 1.072, Triple Stout Porter at 1.078 and Imperial Stout Porter at 1.095 and more. As the 19th century progressed, the porter suffix was gradually dropped.

Advertisement for
Guinness Porter, 1840

The large London porter breweries pioneered many technological advances, such as the use of the thermometer (about 1760) and the hydrometer (1770). The use of the latter transformed the nature of porter. The first porters were brewed from 100% brown malt. Now, brewers were able to accurately measure the yield of the malt they used, and noticed that brown malt, though cheaper than pale malt, only produced about two-thirds as much fermentable material. When the malt tax was increased to help pay for the Napoleonic War, brewers had an incentive to use less malt. Their solution was to use a proportion of pale malt and add colouring to obtain the expected hue. When a law was passed in 1816 allowing only malt and hops to be used in the production of beer (a sort of British Reinheitsgebot), they were left in a quandary. Their problem was solved by Wheeler's invention of the almost black (kilned) patent malt in 1817. It was now possible to brew porter from 95% pale malt and 5% patent malt, though most London brewers continued to use some brown malt for flavour.[13]

Until about 1800, all London porter was matured in large vats, often holding several hundred barrels, for six to 18 months before being racked into smaller casks to be delivered to pubs. Ageing all porter was found to be unnecessary. A small quantity of highly aged beer (18 months or more) mixed with fresh or "mild" porter produced a flavour similar to that of aged beer. It was a cheaper method of producing porter, as it required less beer to be stored for long periods. The normal blend was around two parts young beer to one part old.[14]

After 1860, as the popularity of porter and the aged taste began to wane, porter was increasingly sold "mild". In the final decades of the century, many breweries discontinued their porter, but continued to brew one or two stouts. Those that persisted with porter, brewed it weaker and with less hops. Between 1860 and 1914, the gravity dropped from 1.058 to 1.050 and the hopping rate from two to one pound per 36-gallon barrel.[13]

Neuweiler Porter labels, Pennsylvania, 1960

During the First World War in Britain, shortages of grain led to restrictions on the strength of beer. Less strict rules were applied in Ireland, allowing Irish brewers such as Guinness to continue to brew beers closer to pre-war strengths. English breweries continued to brew a range of bottled, and sometimes draught, stouts until the Second World War and beyond. During the Second World War, because of the Irish Free State's official policy of neutrality, this period was not technically considered wartime, but the country suffered similar resource scarcities and consequent rationing to the United Kingdom, thus this period was officially named the Emergency there. They were considerably weaker than the pre-war versions (down from 1.055–1.060 to 1.040–1.042) and around the strength that porter had been in 1914.[13] The drinking of porter, with its strength slot now occupied by single stout, steadily declined, and the last porter was produced in 1941.[15]

The Anchor Brewing Company started brewing a porter in 1972, and was bottled in 1974 that kickstarted the revival of the style which began in 1978, when the Penrhos microbrewery introduced a porter.[16] A little later, Timothy Taylor, Yorkshire, began to brew a porter. Now, dozens of breweries in Britain are making porter, with Fuller's London Porter winning gold and silver medals at the 1999, 2000 and 2002 International Beer and Cider Competitions, and CAMRA's Supreme Champion Winter Beer of Britain silver medal in 2007, with Wickwar Brewery's Station Porter winning gold in 2008.[17][18][19]

Many breweries brew porters in wide varieties, including pumpkin,[20] honey, vanilla, plum,[21] and chocolate.[22] Specialized porter brews continue the tradition of ageing in barrels, and the use of bourbon barrels is not uncommon.

The letter on WikiSource

Obadiah Poundage was the pen-name of a London brewer of the 18th century who published a letter in the London Chronicle on November 4, 1760 arguing for a rise in the price of beer. The letter was reprinted in various journals, including The Gentleman's Magazine and The Gazetteer, and has since been used by beer historians for the basis of information about porter.[23][24]

Obadiah Poundage was also used as a pen-name by the author of a long-running diary column in What's Brewing, the monthly newsletter of the Campaign for Real Ale.[25]