Numbering rods, associated with John Napier of Merchiston

© National Museums Scotland

000-100-002-619-C

Numbering rods, associated with John Napier of Merchiston

© National Museums Scotland

000-100-102-353-C

Napier's bones

© National Museums Scotland

000-180-000-740-C

Arithmetical compendium
probably made in London

© National Museums Scotland

000-100-102-717-C

Box, for arithmetical compendium
probably made in London

© National Museums Scotland

000-190-001-049-C

Calculating device, known as Napiers box

© National Museums Scotland

000-180-000-735-C