Graduation tower and the Water weel
"Water wheel"
Water wheel at Bad Nauheim-Schwalheim, powered by the Wetter. The wheel run the pumps at the graduation towers in Bad Nauheim by moving a bar.
"Graduation tower"
A graduation tower consists of a wooden wall-like frame which is stuffed with bundles of brushwood. It increases the concentration of a solution of mineral salts. The salty water runs down the tower, and — through the action of breeze and sun — partly evaporates; at the same time certain mineral content of the solution are left behind on the sticks of brushwood.

Salina, Bad Nauheim, DE
Salty spring, Bad Nauheim, DE
Elvis monument, Bad Nauheim, DE