Bulletin of the Bureau of Standards 4

Cover Bulletin of the Bureau of Standards 4
Bulletin of the Bureau of Standards 4
United States Bureau of Standards
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— To sum up the results of this investigation we can say that the theory developed in this paper for the change in resistance and inductance of solenoids due to frequency is fully corroborated by experimental facts. The final expressions given by equations (15) and (26) are very simple and convenient for calculation, and will give accurate results in all cases except when the frequency is exceedingly low. For convenience of reference I reproduce here equations (15) and (26), indicating also the... meaning of the factois involved.
HsOO R' is the change in resistance due to frequency.
£f u u a a inductaUCC " " m '+V^*+i67rV/' 2 w-^ (''=i> 3. 5> 7, 9 ) d denotes diameter of wire.
a " conductivity.
p ^' 2ir frequency.
s ** number of turns per unit length.
a *' internal radius of solenoid.
/ " length of solenoid.
In conclusion, I wish to express my thanks to Prof. M. I. Pupin, of the Columbia University, for his kindness in permitting me to use his private laboratory, where the experimental part of the work was carried out, and I also wish to thank his assistant, Mr.


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