The Cornfield [SEP] material used
The Cornfield
The Cornfield is an oil-on-canvas painting by the English artist John Constable. It was finished in 1826 and first exhibited at the Royal Academy that same year. It measures 143 by 122 cm and hangs in the National Gallery, London.
Constable referred to the painting as The Drinking Boy. It shows a lane leading from East Bergholt toward Dedham, Essex. 
External links.
- "Constable's England", a full text exhibition catalog from The Metropolitan Museum of Art
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