Model diving bell, with sinking weights, 1752.
© Science Museum / Science & Society Picture Library
This is a standard diving bell model of the mid 18th century. It has twelve lead weights which kept it submerged. The wire cage was used to contain small birds or mice so that the bell could be seen in action. This diving bell is asociated with Dr Stephen Demainbray (1710-1782), a science lecturer of the 18th century.