Specific gravity beads
probably made in Edinburgh

© National Museums Scotland

000-100-104-227-C

Specific gravity beads
probably made in Glasgow

© National Museums Scotland

000-100-104-256-C

Sphere
probably made in Edinburgh

© National Museums Scotland

000-100-104-184-C

Sphere (detail)
probably made in Edinburgh

© National Museums Scotland

000-190-002-252-C

Suction pump
made in England

© National Museums Scotland

000-100-104-178-C