Tidens naturlre fig. Tidens naturlre af Poul la Cour Fig Uhrfjeder og Snegl Bogen findes digitalt da Tidens Naturlre Drawing of fusee from Tidens naturlre Nature of time by Poul la Cour Ill The book is digitized at da Tidens Naturlre The fusee was conical pulley that was used in antique clocks and watches to equalize the declining