Vacant New Jersey

Saint Nicholas Coal Breaker

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The gear mechanism from a chance coal jig separator. Unlike the sieve separation method, a jig uses water to sort coal. As coal enters the jig it descends through water at varying speeds. This allows impurities to be separated leaving behind pure coal. Pictured below is a photo of the jig in operation at Saint Nick's, circa 1938.

Close up of above photograph

Image courtesy of Wikipedia.