Pattern room of the Pratt Foundry,

Pattern room of the Pratt Foundry,

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Built next to the gristmill in 1877, after the flood of 1866. The making of patterns, called patternmaking (sometimes styled pattern-making or pattern making), is a skilled trade that is related to the trades of tool and die making and moldmaking. Plaster of paris is usually used in making master dies and molds, as it gains hardness quickly, with a lot of flexibility when in the setting stage.

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figure 30