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Keywords from Image Description:
Tidens naturlre fig. Tidens naturlre af Poul la Cour Fig Vanduhr med Viservrk Vandet lber ind toppen af beholder heri holdes et fast vandnieavu ved at overskydende vand lber ud af et hul bagsiden ved den nskede vandstand ikke vist Det faste vandnieavu giver en ensartet udstrmning fra bunden af hvor vandet samles urkassen bunden