[LM111170], Letter from Arthur Edwin Kennelly to James Gordon MacGregor, November 20th, 1888

Item

Abstract

####[page 88]####Edison Laboratory####Orange####New Jersey ----####20th November 88####Dear Sir####I came quite lately and by accident by a copy of the proceeding of the N.S. inst. of the Nats service in which I recd an admirable paper subscribed by the gentleman whom I now have the honor to address, saluting - the contact resistance between metal and liquid immersing it. This has interested me so much and it bears so completely upon a subject that has been much investigated here, that I take the liberty of communicating with you on the subject.####The paper is so complete in all its main fasts that very little room in left for uncertainty in any direction, but there is one point that it does not clear up and which I hope you will be so good as to clear up for me. It is proved that the transition resistance for a boundary surface between zinc and ---- solution did not in that particular measurement ---- 0.0128 - but it does not say what the strength was of the current that was traversing that surface, although from the magnitude of the resistances mentioned it is presumable that the strength was not great, but it is conceivable that a transition resistance if it insts is a function of the traversing current and that where a current would pass unchecked, a powerful current would find hindrance. In practical experiments convoluted in a manner that precludes the possibility of taking such thorough precautions against chemical impurity####[page 89]####a th-- the paper specifics, prove beyond a doubt that under such conditions of practical operation, a real transition resistance independent of polmigation exists between amalgamated zinc electrodes and the ------ solution surrounding them. There can be no doubt that this resistance may be due to slight traces of oxides or [hystroids?] on the surface of the alloy but also particularly to the presumes -- occluded gases beneath the alloy surface. The fact that careful experiments has shown the absence of transition resistance when care is taken to remain those sources of error is therefore of great values which would be enhanced if you could supply the data as to the limit of current strength invoiced and then greatly oblige####Yours very sincerely#####A.E. Kennelly####Professor MacGregor D.So,####Dalhouise University####Halifax####N.S.####[

Date

1888-11-20

Decade

1880-1889

Type

Identifier

LM111170

Folder Set

LM111

Title

[LM111170], Letter from Arthur Edwin Kennelly to James Gordon MacGregor, November 20th, 1888

Microfilm ID

109:194

Publisher

Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University