. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . cuit, and broughtinto or thrown out of that circuit, accordingto the polarity of the current and the conse-quent position of the said permanent magnet,substantially as set forth. 3. The combination of a polarized bar or cir-cuit-changer with two electro-magnets, oper- ated by a main circuit, substantially as speci-fied, whereby either of the two electro-magnetsmaybe brought into action at pleasure, by theuse of a positive or a negative current, the otherelectro-magnet being at the same time inoper-ative, substantial
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . cuit, and broughtinto or thrown out of that circuit, accordingto the polarity of the current and the conse-quent position of the said permanent magnet,substantially as set forth. 3. The combination of a polarized bar or cir-cuit-changer with two electro-magnets, oper- ated by a main circuit, substantially as speci-fied, whereby either of the two electro-magnetsmaybe brought into action at pleasure, by theuse of a positive or a negative current, the otherelectro-magnet being at the same time inoper-ative, substantially as set forth. 4. Two or more printing-telegraph instru-ments placed in one main circuit, and operateelsimultaneously by pulsations of electricity, thetype-wheel being set by pulsations of one po-larity, and the printing being effected by pul-sations of the opposite polarity, substantiallyas set forth. Dated this 6th day of September, A. D. 1870. THOMAS A. EDISOK. Witnesses: Chas. H. Smith,Geo. T. Pinckney. No. 96,681. T. A. Switch. Patented Nov. 9, N. PETERS. Photo-LHhographer, WmWngton, D. C. United States Patent Office. THOMAS A. EDISON, OF NEW YORK, N ELECTRICAL SWITCH FOR TELEGRAPH APPARATUS. Specification forming part of Letters Patent No. 9€,6§1, dated November 9, 1SG9. To all whom it may concern: Be it knoAvii that I, Thomas A. Edison, ofthe city, county, and State of New York, haveinvented a new and useful Improvement inAutomatic Electrical Switches; and I do here-by declare the following to be a full, clear, andexact description thereof, which will enablethose skilled in the art to make and use thesame, reference being had to the accompany-ing drawing, forming part of this specifica-tion, in which drawing— Figure 1 represents a plan or top view ofthis invention. Fig. 2 is a longitudinal sec-tion of the same. Similar letters indicate corresponding parts. This invention relates to a certain novel ar-rangement of branches of one
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Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone
