[LM111327] Test Report, January 29th, 1889


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[LM111327] Test Report, January 29th, 1889

Editor's Notes

Additional Remarks##The following test of a meter for the standardizing Bureau has elicited more than one point of interest in connection with the new method of treatment.##The meter in question was specially designed, to have two shunts and two bottles such that the transfer in milligrammes in cash when mutliplied by four and by eight respectively should produce the numbe rof ampere hours under registration.##The test was made by connecting this meter in series with two standard meters themselves in parallel and passing a current of some 30 ampere steadily through the circuit for about 38 hours during 48.##In the first trial the plates were amalgamated hot and cleaned with brushes in the usual way. The solution was very slightly acid and was boiled. The results obtained showed a decided loss of weight in each couple. This was not attributable to any decomposition of zinc by here acid since no hydrogen had been visible at any time on the plates which retained their bright tube, and also because the discrepancies were irregular. The loss was traced on examination to amalgam that adhered to the sudden screw connections and had not been completely removed by the brushed. It is noticeable that the amalgam produced at boiling water temperature is of a more viscuous nature than that formed under existing treatment and thus calls for a more thorough removal from the connection holes in the plates.##Or repeating the test with attention to this point the results shown are very satisfactory but the solution having been purposely rendered neutral (by the addition of zinc hydrate in excess the precipitate being filtered off) the plates hydrated, gained weight and tarnished.
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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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