Pure Products Volume 1

Pure Products Volume 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...the methods in question are based. They comprise: (1.) Colorimetry, (2.) Polarization, (3.) Refractometry. Colorimetry takes advantage of the varying intensity of color of solutions like beer, wort, etc., to determine their concentrations. The polarimetric method serves chiefly for the detection and quantitative estimation of sugars. Refractometry is based on the fact that light rays, in passing from one medium to another, change their direction, or are refracted. The degree of this refraction affords indications as to the amount of a dissolved substance, or in regard to the nature of a given solid. The two methods first mentioned are rather limited in their application, but refractometry appears capable of very general use. Although instruments for the determination of refractive indices of solids have been used since the middle of the nineteenth century, it is only since the beginning of the seventies that refractometers have come into practical use. It was then that Abbe designed an instrument which was destined to inaugurate a new branch of optical research, and which has served as a pattern after which all other refractometers have since been constructed. A spectrometric-hydrometric apparatus has been devised by Hercules Tornoe for the determination of extract in beer. One of these instruments is in use at the Scientific Station for Pure Products, and has been found to give very accurate results. For every determination it requires several adjustments. It is obvious that an apparatus, in the manipulation of which only one adjustment is necessary, would be more convenient than Tornoe's. Abbe has said that the apparatus might be considerably simplified, and its manipulation accomplished in much less time, if the measurements were based...show more

Product details

  • Paperback | 260 pages
  • 189 x 246 x 14mm | 472g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236771125
  • 9781236771124