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sure implies a constant current, to measure which the Edison meter has been invented. Mr. Edison is the fortunate possessor of that rare combination of faculties, superior inventive ability, supplemented by unusual business qualifications and, to his intimates, the fact that he has invented a device is a sufficient guarantee of its commercial utility.
The foregoing statement holds good with regard to the Edison meter for the measurement of the electric current supplied to one or more incandescent lamps, and is called up by the fact that upon the introduction of this meter the claim that it was practical in its operations and sufficiently accurate to form the basis for the chains to be made the users of light, was ridiculed by many who would be well pleased had they withheld their opinions till time and use had paved the way for a more just decision upon the merits of the piece of apparatus in question. Time and daily use have proven the Edison meter not only reliable but beyond that, a standard for charges satis-
