By Charles Singer et al (eds)

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Gustavus Vasa (1523-60) encouraged the building o f blast-furnaces, and, to improve the quality o f Swedish iron, invited foreigners to assist the young Swedish industry. B y 1620 Swedish exports o f cast iron cannon already aroused concern in England, which had enjoyed almost a monopoly. In the early eighteenth century two Swedish scientists, Emanuel Swedenborg (1688-1772) and Christopher Polhem (166 1-1751), did much to improve Swedish metallur­ gical and mining methods. A s a result, the production o f their country rose to 32 600 tons in 1720 and to 51 000 tons in 1739.

1955. NNE, Charles. ’ Jacques D u-Puys, Paris. 1567. (Published in Latin as Praedium rusticum , Paris. ) S erres, O livier de. ’ Paris. 1600. [15] S torck, j . and T eague, W. D. ’ University o f Minnesota Press, Minneapolis. 1952. Agostino. ’ Published by the author, Paris. 1588. [17] Bockler, G. a . Theatrum machinarum novum. Cologne. 1662. [18] F ilby, F. a. ’ Allen and Unwin, London. 1934[19] Boyle, Robert. P h il. , t o , 329,1675. [20] D oorman, G. ‘Patents for Inventions in the Netherlands’, pp.

N or were the next two genera­ tions o f chemists more successful. T h e usual method o f analysing a foodstuff was to submit it to destructive distillation; the ‘watery’, ‘oily’, and ‘saline’ products obtained were then examined, and many erroneous conclusions drawn. Some THE RISE OF DIETETIC SCIENCE 25 chemists thought they could distinguish between ‘alkaline’ and ‘acid’ foods, and prescribed their use accordingly. N ot till the late eighteenth century were new views on the nature o f chemical compounds established, as the result o f the investigations o f Black (1728-99), Priestley (1733-1804), Scheele (1742-86), and Lavoisier (1743-94).

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A History of Technology by Charles Singer et al (eds)

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