Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER II APPARATUS FOR ELECTROCHEMICAL ANALYSIS Many metals can be more conveniently determined electrolytically than by any other method, and means for carrying out such determinations should be provided in every well-equipped metallurgical laboratory, no matter how small it may be. In determining copper, nickel, bismuth, etc., the electrolytic methods are far more satisfactory than the precipitation or volumetric ones, hence in a laboratory where bearing metals or alloys are analyzed means should be provided for electrolytic work. Use of the Electric Lighting Current. ? Stillwell and Austin1 were, we believe, the first to suggest the use of the electric lighting current for the determination of metals in the electrolytic way, and the writers have found this to be not only sufficient for ordinary technical purposes but also by far the most convenient. When available, it is much cheaper than batteries and saves the operator much trouble. The only disadvantage in connection with its use is the constant voltage, which is usually 110 or 220. Indirect or alternating currents must of course be transformed to direct currents. This necessitates the use of a convertorwhich may make the cost of installation of the outfit for electrolytic work so great as to make the use of batteries preferable to that of the electric lighting current. 1 Jour. Anal, and App. Chem., VI, 129. It is of course necessary to reduce the voltage of the current. For this purpose the resistance board shown in Fig. 1 and designed by one of the authors is convenient and satisfactory. It consists of a stout board 2 inches thick and 24 inches by 8 inches. This board should have its top covered Kg. 1. with a piece of asbestos board, to guard against fire, etc., so that the apparatus may be left overni...Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos.
|Title||:||The Technical Analysis of Brass, and Non-Ferrous Alloys|
|Author||:||William Benham Price|
|Publisher||:||General Books - 2012-02|