Hourglass; first of two views, with automatic counter.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Hourglass; first of two views, with automatic counter. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Hourglass; first of two views, with automatic counter. Wellcome Collection. Source: Wellcome Collection.