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Leupold's "Theatrim Machinarum," which fell into his hands, gave an account of the machinery, furnaces and methods of mine-working in the upper Hartz. Alas! the book was in German, and he could not understand it. He promptly resolved to master the language, sought out a Swiss-German dyer then settled in Glasgow whom he engaged to give him lessons. So German and the German book were both mastered.
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