1890 Patent No. 16,653 measuring electric currents, Stanley Currie, Philadelphia

Patent No. 16,653 A.D.1890 Improvements in Apparatus for Measuring the Strength of Electric Currents

"I, Stanley Charles Cuthbert Currie, a subject of the Queen of Great Britain, but now residing at Room 850 Dresell Building, 5th & Chesnut Streets, in the City of Philadelphia, and State of Pennsylvania, United States of America, Electrical Enginer, do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement: In my invention relating in general to apparatus for measuring the strength of electric currents use is made of finely divided iron filings and an insulating adhesive material, whereby the apparatus or instrument is adapted to alternating as well as direct currents..."

2 pages of text + 1 drawing which have been disbound from a larger volume.

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