Charles Edouard Guillame was the person that discovered Invar and Elinvar, nope they are definitely not islands, but nickel based alloys which will withstand magnetic fields allowing an eye fixed to be capable of precise. Other alloy-based materials likewise include Glucydur and Nivarox of widely used by watchmakers from the 1950's.Apart from employing alloys, one other method of creating non-magnetic watches has been a greatly conductive material to accommodate the movement within the case.
As mentioned previously it had become Vacheron Constantin that first developed these watches; in 1915 they introduced the really first anti-magnetic pocket watch. That it was then accompanied by Tissot's non-magnetic wristwatch in 1920, and therefore the first anti-magnetic chronograph by Vacheron Constantin in 1954.
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