Abstract
THIS is the third volume of a useful electromechanical encyclopædia. The author classifies electric apparatus into four groups. First, there is small apparatus, that is, apparatus for use at low voltages and that does not take a current greater than twenty-five amperes; next he deals with large low voltage apparatus which takes currents greater than twenty-five amperes. The third class consists of high voltage apparatus, the pressure not exceeding 33,000 volts but the current being of any value. The fourth class consists of very high voltage apparatus, the pressure exceeding 33,000 volts. We learn that the French Minister of Public Works standardised the voltage of supply at 230 in July 1925. The pressure of supply of all work completed after that date is to be 115, 230, or 460 for direct current supply, and 115 or 230 for all systems of supply installed after that date. The frequency also is to be 50. Like England, however, it will take a long time before all the pressures of supply are standardised.
L'Appareillage électrique: le petit appareillage, le gros appareillage basse tension, l'appareillage haute tension, tableaux de distribution, postes de transformations ruraux; construction, applications.
Louis Lagron. (Nouvelle Encyclopédie Électromécanique, No. 3.) Pp. 587.(Paris: Albert Blanchard, 1930.) 36 francs.
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L'Appareillage électrique: le petit appareillage, le gros appareillage basse tension, l'appareillage haute tension, tableaux de distribution, postes de transformations ruraux; construction, applications . Nature 126, 721 (1930). https://doi.org/10.1038/126721a0
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DOI: https://doi.org/10.1038/126721a0