Bulletin of the Bureau of Standards Volume 9, Nos. 187-203

Bulletin of the Bureau of Standards Volume 9, Nos. 187-203

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 edition. Excerpt: ...the concentration being the same; currents 0.028, 0.0028, 0.00028 ampere per sq. cm, respectively. X 5 Figs. 42,43.--Showing that the size and spacing of the crystals is dependent on the concentration of the electrolyte, the current being the same; concentrations 5 per cent, 15 per cent, respectively Fig. 45.--Deposit from a silver nitrate solution to which silver acetate has been added. Showing two kinds of deposit. X 16 Fig. 47.--(a), (b), (c), have been prepared to illustrate tne statements made above respecting the relation between the distance apart of the crystals, the conductivity of the electrolyte, and the density of the electric current. Two equipotential surfaces that lie within the platinum are shown as emerging into the electrolyte around the silver crystal are fine and very close together and sometimes they are coarse and relatively far apart, and between these extremes any size or spacing may be obtained by varying the conditions. These conditions are the same as those which determine the spacing of striae, namely, the current density (see Figs. 39, 40, 41), concentration (see Figs. 42, 43), and temperature. In order to obtain quantitative results a large number of deposits were made in the field of a microscope on a platinum cathode that had been ruled into squares by a fine diamond. The rulings were 0.2 mm apart, so that each square millimeter was divided into 25 equal squares. Thus the crystals could be counted, using a certain current density and time and a definite concentration of the electrolyte. Then the conditions could be varied, and so the relation between these conditions and the number of crystals per unit of area could be determined. At the start crystals were deposited and a map of a portion of the field made, ..
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Product details

  • Paperback | 162 pages
  • 189 x 246 x 9mm | 299g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236550773
  • 9781236550774