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By Charles Singer et al (eds)

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Similar experiments were made by Stevins o f Edinburgh (1777), who found like R ^ u m u r that food was softened and dissolved in the stomach, and also by Spallanzani (1729-99). Lavoisier finally approached modem theories, holding that the products o f digestion are carried to the lungs by the blood-stream and oxidized there. These few examples show how modem views on diet and nutrition were beginning to dawn at the close o f the eighteenth century. W e observe the following factors playing an ever-growing role: 1.

H. Cardalucius, in his notes to Ercker (1672), recommends equal parts o f copper and tin to which, when molten, are added one part o f arsenic, one-half part o f antimony, and one-half part o f tartar. Since there was no control o f mechanical properties in the resulting product, the alloy was ripe for experimentation. M errett, in his English translation (1662) o f Neri, mentions additions o f antimony, bismuth, mercury, silver, and zinc. T h e Royal Society records a letter (1672) from Isaac Newton, inventor o f the reflecting telescope, in which he remarked that speculum-metal often contained small pores, visible only under the microscope, which wear away faster than the rest o f the metal during polishing and thus spoil the image.

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. 55-58. Nijhoff, T he Hague. 1942B IB L IO G R A P H Y A insworth-D avis, j . R. ’ D ent, London. 1931. Burema, L. ’ Van Gorcum, Assen. 1953. D rummond, J. C and W ilbraham, A.

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

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