. Electrical world. importance of this article in the manu- May 28, 1904. ELECTRICAL WORLD and ENGINEER. facture of paint, dry batteries, stove polish, motor-generator brushes,etc. Special attention is given to the use of this form of pigmentfor high-grade protective coatings on structural iron and steel. The Hutchison Acoustic Companys booth and exhibit were com-pleted at the opening and Mr. M. R. Hutchison gave demonstra-tions of his acousticon and massacon, electromagnetic instrumentsfor the alleviation of deafness. Two congenital deaf mutes were the conduit, manholes and cables is just as
. Electrical world. importance of this article in the manu- May 28, 1904. ELECTRICAL WORLD and ENGINEER. facture of paint, dry batteries, stove polish, motor-generator brushes,etc. Special attention is given to the use of this form of pigmentfor high-grade protective coatings on structural iron and steel. The Hutchison Acoustic Companys booth and exhibit were com-pleted at the opening and Mr. M. R. Hutchison gave demonstra-tions of his acousticon and massacon, electromagnetic instrumentsfor the alleviation of deafness. Two congenital deaf mutes were the conduit, manholes and cables is just as they are placed beneaththe street surface. An excavation is made at one side so that thecross-section of the whole subsurface installation is open to view,as shown in the illustration. The cable reel and capstan are placedat the manholes ready for actual operation. Over the conduit aeriallines and cables are extended between two poles, and these serveto indicate the method of connection and distribution between the. FIG. 3.—EXHIblT OF ACOLSTIC provided by the Educational Department and these boys, who hadheard no sound from birth, were made to hear music and the voiceby using the acousticon. This instrument consists of a small battery,a specially-designed telephone receiver, and a transmitter whichamplifies the sound and imparts the waves to auditory nerves. Themassacon is a magnetic instrument which emits sound waves insharp saw-tooth form and sets the ear drum and auricles in vibra- FIG. 4.—EXHIBIT CF II ROY CLAY WORKS ANU STANDARD UNDERGROUNDCABLE COMPANY. overhead and subsurface lines. A number of cabinets contain sim-ples of telephone, lighting and power cables made by the StandardInderground Cable Company. The Edison historical exhibit, made under the auspices of of Edison Illuminating Companies, contains a collec-tion of early generators, motors and other apparatus constructedunder the personal direction of Mr. Edison when electri
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
