Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 146
Fig. 63. High Voltage Disconnecting Switch for Arrester. LESSON 10. Magnetism. introduction. The natural magnet has been known for ages. TheEgyptians and Greeks in their writings long before theChristian era mentioned that a certain mineral attractediron and steel. They also knew that a piece of… … Fig. 64. Natural Magnet: A piece of Magnetite or Black Oxide of Iron. just as if it had become a piece of the mineral. Fig. 64. Who first discovered that the mineral would point tothe north, we do not know, but in the year 1200 A. D.Arabs brought compasses to Europe. The mineral was called lode…
Electricity
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
