Show Armor Plate Dates Datu to 1855 the history ot of armor plate goc goes back to hen the French first used metal to protect the sides of their shIps ot of war The first plate was as made ot of cast Iron but this gave way ay later Inter to n a plate m mode Ide ot of Iron with steel poured otter o the surface This in 10 time also gale ga way to case hardened steel that Is steel with a percentage ot of carbon near the surface and aDd to steel al lobed loed with nickel The plate at al alone atone one time was as much as 22 2 inches thick but modern methods of at treating the steel ha have hae e mu male Je such extreme thickness unnecessary 11 Star |