George Fuller's spiral slide rule, no 849, c 1880.

George Fuller's spiral slide rule, no 849, c 1880.
Fuller's spiral slide rule, no. 849, made by W.F. Stanley, with an instruction booklet, c.1880. The spiral slide rule was invented to increase the length of the scale, and hence the accuracy, of the conventional slide rule. The Fuller's instrument also contains printed mathematical tables.
 
Currently on display in:
Making the Modern World
Year made :
c.1880
Inventory number :
1906-57