Ten inch slide rule, faced with celluloid, in case

Ten inch slide rule, faced with celluloid, in case, steel-spring back, and metal cursor, with hair line on glass, cursor stamped D.P. D.R.G.M., ruler stamped D.R.P. no. 126499

Details

Category:
Mathematics
Object Number:
1911-253
type:
slide rule
credit:
Davies, J. and Son Ltd. (Derby)