. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . ndmeans for preventing the spark at such points,due to the discharge of the magnets, substan-tially as set forth. 7. The combination, with the controlling 30electro-magnetic switch and the operating elec-tro-magnets, of shunts around said operating-magnets, and metallic shells upon the same,for preventing spark at the contact-points ofsaid switch, substantially as set forth. 35 8. The combination, with the resistance-commutator, such as described, of the flexiblecontact-arm carrying a contact-point, the piv-oted bar
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . ndmeans for preventing the spark at such points,due to the discharge of the magnets, substan-tially as set forth. 7. The combination, with the controlling 30electro-magnetic switch and the operating elec-tro-magnets, of shunts around said operating-magnets, and metallic shells upon the same,for preventing spark at the contact-points ofsaid switch, substantially as set forth. 35 8. The combination, with the resistance-commutator, such as described, of the flexiblecontact-arm carrying a contact-point, the piv-oted bar carrying said spring-arm, the oper-ating electro-magnets acting oppositely upon 40said bar, and one or more dash-pots and plun-gers for retarding the movement of said bar,substantially as set forth. This specification signed and witnessed this28th day of November, 1882. THOS. A. EDISON. Witnesses: H. W. Seely,E. H. Pyatt. (No Model.) 2 Sheets—Sheet 1. T. A. EDISON & C. L. CLARKE. REGULATOR FOR SYSTEMS OF ELECTRICAL DISTRIBUTION. No. 287,525. ^ Patented Oct. 30, N. PETERS. Phclo-Lilhographer. Washington. D. C. (No Model.) 2 Sheets—Sheet 2. T. A. EDISON & C. L. CLARKE. REGULATOR FOR SYSTEMS OF ELECTRICAL DISTRIBUTION. No. 287,525. Patented Oct. 30, 1883.
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Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone
