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The screw jack on the stone crane, used to lift millstones, at the historic #Shriver Grist Mill at the #UnionMillsHomestead. The screw jack is one example of many #simplemachines in an automated mill. Come see our new exhibit about grist mills as early industrial sites. #gristmills #CarrollCountymd #mdinfocus. Taken by unionmillsmd on Saturday 10. June 2017 using the filter Ludwig

The screw jack on the stone crane, used to lift millstones, at the historic #Shriver Grist Mill at the #UnionMillsHomestead . The screw jack is one example of many #simplemachines in an automated mill. Come see our new exhibit about grist mills as early industrial sites. #gristmills #CarrollCountymd #mdinfocus

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