d the other with air containing a heavy percentageof humidity. A wire leading from the negative poleof a static electrical machine is attached to the com-partment containing the dry air, while another wireled from the positive pole is connected to the cham-ber containing the moist air. When the… … ELECTBICAL APPABATUS BY WHICH EXFEBIHENTS ON WEATHEB CONDITIONS WEBE HADE. showers, mists, and thunderstorms, Prof. Gates con-trives on a similar scale the more violent eruptionsof nature, such as cyclones and waterspouts, withequal facility. To the bottom of an ordinary saucerfilled with water a ■…
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![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)](https://img.insideoutlibrary.com/img/200/ia-cu31924022817674-152-41.webp)
