A feature of mosque lamps such as the one shown in the background here, is a glas rod in the centre of the bowls of the lamp. The English 18th century lamp on the left is known as a lacemaker's lamp. The lamp in the middle is of similar age and origin, having a float wick, while the simple lamp on the right, from southern France, is a little later. The float wick pases through a hole in a flat cork covered with sheet metal, which protects it from the flame.
© Science Museum / Science & Society Picture Library