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HEART OF BIG HUN CANNON Zirconium said to be the hardest metal in exist ¬ ence and possessed of the greatest power of resist ¬ ance is used in the manufacture for the seventy fivemile guns with which the Hun bombarded Paris This metal according to reports is used in an alloy with steel Zirconium ore was discovered in the State of Sao Paulo Brazil shortly before the war Large quantities of the metal were bought by Germany on two occasions and its manufacture into steel undertaken it was found to give gun tubes tremendous resistance it is reported and to render them capable of withstanding the effect of moat severe explosions
