The Monk by the Sea [SEP] material used
and painted them in his studio, using freely drawn plein air sketches, from which he chose the most evocative elements to integrate into an expressive composition. The composition of "The Monk by the Sea" shows evidence of this reductive process, as Friedrich removed elements from the canvas after they were painted. Recent scientific investigations have revealed that he had initially painted two small sailing ships on the horizon, which he later removed. Friedrich continued to modify the details of the painting right up to its exhibition—to the sky's
to cathodically protect metals that are exposed to sea water. A zinc disc attached to a ship's iron rudder will slowly corrode while the rudder stays intact. Similarly, a zinc plug attached to a propeller or the metal protective guard for the keel of the ship provides temporary protection.
With a standard electrode potential (SEP) of −0.76 volts, zinc is used as an anode material for batteries. (More reactive lithium (SEP −3.04 V) is used for anodes in lithium batteries ). Powdered zinc is used in