Rylands Library Papyrus P52 [SEP] material used
Rylands Library Papyrus P52
The Rylands Library Papyrus P52, also known as the St John's fragment and with an accession reference of Papyrus Rylands Greek 457, is a fragment from a papyrus codex, measuring only 3.5 by 2.5 inches (8.9 by 6 cm) at its widest; and conserved with the Rylands Papyri at the John Rylands University Library Manchester, UK. The front (recto) contains parts of seven lines from the Gospel of John 18:31–33, in Greek, and the back (verso) contains parts
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