Circular slide rule, 1660-1680.

Circular slide rule, 1660-1680.
A circular slide rule, made by John Brown, with two brass radial arms and an stronomical quadrant engraved on the back. A spiral slide rule affords a long and therefore accurate logarithmic line in a small amount of space. The potential of spiral rules was not really utilized until the Victorian period, when several spiral and helical designs appeared on the market.
 
Currently on display in:
Mathematics
Year made :
1660-1680
Inventory number :
1954-433
 

Related Images

2 related image(s)