The Model Engineer and Practical Electrician Volume 17

The Model Engineer and Practical Electrician Volume 17

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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. 1907 edition. Excerpt: ...On fitting sheet-metal screens, however, this effect was obliterated. If these relays are used with a recorder or other instrument taking a very heavy current, it may be found necessary to interpose a second relay wound with thicker wire between the two, as if the current passed is too strong, the magnetism in the polarised relay and the spring in the non-polarised relay may not be powerful enough to separate the platinum contacts, if these instruments are at all finely adjusted. (To be continued.) A Novel Plating Process.--In a novel electroplating process recently developed in France, the solution--which may be of any of the usual plating baths--is contained in a brush, which is connected to the positive pole of the electric circuit, while the object to be plated is connected to the negative pole, and simply brushing the well-cleaned object gives a regular and adherent deposit. The thickness of the layer formed depends on the duration of the brushing, and the number of applications to each spot. Larger objects than usual can be covered, and a surface may be plated with several different metals, thus giving a varied decoration. Chats on Model Locomotives. By Henry Greenly. (Continued from paze 302.) Locomotives And Railway Curves. FOR a considerable time past there appears to have been some doubt among Model Engineer readers and others as to the "curve-negotiating" properties of model locomotives and railway vehicles. Statements have been made on the subject--possibly I have been responsible for some of them--which tend to show differences of opinion as to the minimum curve round which a given engine will travel, and although not the result of sheer perversity, they are apt to mislead the unsophisticated. For instance, it was...show more

Product details

  • Paperback | 378 pages
  • 189 x 246 x 20mm | 671g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236887093
  • 9781236887092