. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . m T. A. Electro-Mag net for Relays, & c. No. 160,405 Patented March 2, THE GRAPHIC PARK PLACE, United States Patent Office, THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO HIMSELFAND GEORGE HARRINGTON, OF WASHINGTON, D. 0. IMPROVEMENT IN ADJUSTABLE ELECTRO-MAGNETS FOR RELAYS, &c. Specification forming part of Letters Patent No. 160,405, dated March 2, 1875 ; application filed July 29, 1873. To all whom it may concern: Be it known that I, Thomas A. Edison, ofof
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . m T. A. Electro-Mag net for Relays, & c. No. 160,405 Patented March 2, THE GRAPHIC PARK PLACE, United States Patent Office, THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO HIMSELFAND GEORGE HARRINGTON, OF WASHINGTON, D. 0. IMPROVEMENT IN ADJUSTABLE ELECTRO-MAGNETS FOR RELAYS, &c. Specification forming part of Letters Patent No. 160,405, dated March 2, 1875 ; application filed July 29, 1873. To all whom it may concern: Be it known that I, Thomas A. Edison, ofof Newark, in the county of Essex and Stateof New Jersey, have invented an Improve-vementin Adjusting Electro-Magnets, of whichthe following is a specification: With an electro-magnet employed for asounder or receiving-instrument it is very dif-ficult to adjust the action, because the intens-ity of the current varies greatly, and frequentlyfalse currents reach the magnet and preventits proper action. To provide for these va-rious circumstances, it is usual either to varythe tension of the retractile spring, or adjustthe position of the armature and core in rela-tion
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