Set of flat, boxwood, Napier's rods
1600-1699
Set of eleven strips based on Napier's bones
1673
'La Multi' calculator, c 1920.
1918-1922
Model of Napier's bones made in perspex for use with overhead projector
1972
Set of plastic demonstrative Napier's Bones on mahogany base
1920-1930
"Napier's Rods" in case with descriptive leaflet
1888