[LM112192], Letter from Arthur Edwin Kennelly to Edison Machine Works, Samuel Insull, December 14th, 1889

Item

Abstract

In accordance with your instructions I have tested two wires of tinne and untinned opper received from Mr. Kruesi, to measure the effect of the tinning upon the conductivity of the wires as a whole. I have found that the diminution of conductivity in this specimen was very closely what might be predicted fromj a calculation of the effect of superposing a cylinder of tin upon the wire and I therefore enclose a tube which will enable you to detect at a glance shte percentage of average conductivity but on the average by a wire of stated diameter covered with a given thickness of tin. You will thus notice that taking for instance the specimen tested whose diameter was 0.042" covered with a layer of about 0.0001 tin the conductivity was reduced about one per cent. The effect rapidly becomes negligible with large wires.##I have furnished Mr. Kruesi with a copy of the talbe together with a report of the complete test and calculation.

Mentions

Date

1889-12-14

Decade

1880-1889

Type

Identifier

LM112192

Folder Set

LM112

Title

[LM112192], Letter from Arthur Edwin Kennelly to Edison Machine Works, Samuel Insull, December 14th, 1889

Microfilm ID

109:380

Publisher

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