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20' 'wet crushing rolls, North Broken hill.'.View of 25" x 212" Ruwolt designed primary cone (gyratory) crusher, March 1939 View of 3 gearboxes, 2 with top cover removed, to drive 48 x 20 wet crushing rolls for North Broken Hill Ltd., April 1938. Photo taken in Charles Ruwolt Fitting Shop showing one man standing by the third gearbox Crushing rolls were used as a stage of mined ore size reduction to liberate the minerals, in this case silver, lead and zinc at Broken Hill.

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