y, and the apertures the center line of the windows. are formed by cutting half from each plate, a very simple dents who would hardly feel warranted in purchasing one of In front of the revolving plate, B, two combs or collectors, matter as compared with cutting the three holes from an them, who… … edges of the apertured disk, A. The points chine fully as efficient as the best in mar- APERTURED DISKS. of the combs each cover a space 2% inches ket; and that, too, without any consider- long, or about equal to the width of the able outlay for materials. Without de- paper inductors. Care should…
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