Scientific American Supplement, No. 415, December 15, 1883

Scientific American Supplement, No. 415, December 15, 1883

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Excerpt: ... experiments have shown, for example, that artichoke spirits, which could not be utilized by the old processes, give through hydrogenation an alcohol equal to that derived from Indian corn.--La Nature. PLASTIC CARBON FOR BATTERIES. Max Nitsche-Niesky recommends the following in Neueste Erfindung.: Good coke is ground and mixed with coal-tar to a stiff dough and pressed into moulds made of iron and brass. After drying for a few days in a closed place, it is heated in a furnace where it is protected from the direct flames and burned, feebly at first, then strongly, the fire being gradually raised to white heat which is maintained for 6 or 8 hours. The fire is then permitted to slowly go down, and when perfectly cold the carbon is taken out of the furnace. RECENT STUDIES ON THE CONSTITUTION OF THE ALKALOIDS. By SAMUEL P. SADTLER, Ph.D. Footnote: Introductory lecture, Course of 1883-84, Philadelphia College of Pharmacy. The sciences of to-day present, as might be expected, a very different aspect from the same branches of knowledge as they appeared fifty or sixty years ago. It is not merely that the mass of observations in most of these lines of study has enormously increased during this interval. Were that all, the change could hardly be considered as an unmixed benefit, because of the increased difficulty of assimilation of this additional matter. Many would be the contradictions in the observations and hopeless would be the task of bringing order out of such a chaos. The advance in the several branches of knowledge has been largely one resulting from improved methods of study, rather than one following simply from diligence in the application of the old ways. Let us turn to chemistry for our illustration of this. The chemistry of the last century and the early decades of this was largely a descriptive science, such as the natural history branches, zoology, and botany are still in great part. Reasonably exact mineral analyses were made, it is true, ..
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Product details

  • Paperback
  • 189 x 246 x 2mm | 86g
  • United States
  • English
  • black & white illustrations
  • 123671170X
  • 9781236711700