The Electrical Conductivity of Commercial Copper Page: 103
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DEPARTMENT OF COMMERCE
BULLETIN
OF THE
BUREAU OF STANDARDS
Vol. No..j
THE ELECTRICAL CONDUCTIVITY OF COMMERCIAL
COPPER
By F. A. Wolff and J. H. Dellinger
CONTENTS
Page
I. Introduction ................................................. . 104
I. Notes on table of standard values............................ .. o4
2. Table I. Standard values ................................ 105
3. Scope of this investigation ................................... io6
II. The experimental work ........................................... . o8
i. The Thomson bridge method................................. . o8
2. The apparatus........................................... iii
III. Results obtained................................................. I 13
i. Resistivity of commercial copper .......................... I13
2. Copper of especially high conductivity ........................ .114
3. Data on hard-drawn aluminum ............................... 15
IV. Discussion of results ................................... .......... . I17
I. Annealed copper wires .......................... ...... ..... I 17
(a) Summary of above data............................. 117
(b) Summary of data from American Brass Company...... 117
2. Hard-drawn copper wires........... ................ . .... I18
3. The highest conductivity found ............................... 118
4. Aluminum .................... ..... .... ..... .... ........ 19
5. Temperature coefficient of copper ............................ . 19
V. Conclusions ...................................... .. ........... 121
i. Best value for the resistivity of annealed copper......... ......... 121
2. Density of copper ........................................ 122
3. Temperature coefficient of annealed and of hard-drawn copper.. 122
4. Percent conductivity ...................................... 122
5. Data for use in wire tables .................................. 123
6. The expression of resistivity in ohms per meter-gram ........... 123
7. Desirability of an international standard of copper conductivity.. 124
VI. Summary. .......... .... ... ......... 125
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Wolff, F. A. & Dellinger, J. H. The Electrical Conductivity of Commercial Copper, report, 1911; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc66529/m1/1/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.