Heritage Open Day: Potteries Heritage Society is opening up a wealth of information about bottle ovens. Each of the 29 separate bottle oven sites in Stoke-on-Trent will feature a QR code link to Bottle Oven Facts, as well as further information about bottle oven types. Once commonplace in the city of Stoke-on-Trent, only 50 bottle oven structures remain. In celebration of the city's centenary, each of the 29 sites where one or more bottle ovens can be found will have a special HODs-branded sign including a QR code linking to information about the location and the type of ovens. Over 40 pages of 'Bottle Oven Facts' have been created to fit the screen of your smart phone or tablet, including all sites, oven types, locations and interactive maps.