How does a Table Fountain work?

This lovely animation shows water flowing in a medieval table fountain, based on:

Table Fountain, c. 1320-1340. France, Paris, 14th century. gilt-silver and translucent enamels, Overall: 33.80 x 25.40 x 26.00 cm (13 1/4 x 10 x 10 3/16 inches). Gift of J. H. Wade 1924.859

Animated Representation of a Medieval Table Fountain