A bottle oven or bottle kiln is a type of kiln. The word 'bottle' refers to the shape of the structure and not to the kiln's products, which are usually pottery.
Bottle oven at Minkstone Works, Longton
Exterior of bottle ovens at the Gladstone Pottery Museum that was formerly a pot-bank in Longton
Looking at the kiln from inside the hovel
Kiln floor, the well-hole and bags
A saggar is a type of kiln furniture. It is a ceramic boxlike container used in the firing of pottery to enclose or protect ware being fired inside a kiln. The name may be a contraction of the word sa
Saggars in use in the Manufacture nationale de Sèvres
Bungs of saggars inside a bottle kiln