The Potteries Bottle Oven - the dominant and characteristic feature of The Potteries for more than 250 years - more here>
The bottle oven: a huge, brick-built, bottle-shaped structure, up to 70 feet (20 metres) high, essential in the pottery-making process. There four main types of bottle oven in The Potteries of North Staffordshire. Each type had its own particular purpose, but they all had the bottle-shaped chimney stack.
There's lots more about The Potteries Bottle Oven, and what it is here> at The Potteries Bottle Oven site.