Galvanizing protects in two ways: 1  It forms a coating of corrosion-resistant zinc which prevents corrosive substances from reaching the more delicate part of the metal. 2  The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc.he earliest known example of galvanizing of iron, encountered by Europeans is found on 17th century Indian armor in the Royal Armouries Museum collection. It was named in English via French from the name of Italian scientist Luigi Galvani.
Keyboard and pedals. Almost every modern piano has 88 keys (seven octaves and a bit, from A0 to C7). Many older pianos only have 85 (from A0 to A6), while some manufacturers extend the range further in one or both directions.
A normal piano has the following dimensions: width 145 to 150 cm, height 115 to 125 cm, depth 52 to 60 cm. A typical keyboard has 61 keys today. The sound frequencies of the 88 keys on the piano are: Piano. key number.