Octant
probably made in London

© National Museums Scotland

000-100-104-189-C

Octant (detail)
probably made in London

© National Museums Scotland

000-190-002-051-C

Surveyors' level
probably made in London

© National Museums Scotland

000-100-104-236-C

Universal equinoctial ring dial
probably made in London

© National Museums Scotland

000-100-102-655-C