Sand Glass of 15 Seconds

anonymous, c. 1860, sand glass, NG-MC-1118-1

On display in room 0.13

Sand Glass of 30 Seconds

anonymous, c. 1860, sand glass, NG-MC-1118-2

On display in room 0.13

Sand Glass of 30 Seconds

anonymous, c. 1860, sand glass, NG-MC-1118-3

On display in room 0.13

Three Sand Glasses

anonymous, c. 1860, sand glass, NG-MC-1118