Construction and calculation of absolute standards of inductance
J. G. Coffin · Bulletin of the Bureau of Standards · 1906
It is hoped that the following account of the theory and methods of construction will direct the way and materially decrease the labor of any future undertakings of a similar character.Very little is to be found anywhere on the precautions to be taken in very precise work of this kind, and there were but few formulae accurate enough for the calculation of the completed standard in absolute measure.It is hoped that the pres- ent paper will to some extent fill this lacuna in the literature of the subject.The construction of a standard of inductance involves many con- siderations.A primary standard need not necessarily be of a con- venient size or weight for ordinary use, but qu the other hand it should not be too difiicult to manage under favorable circumstances.A standard of any kind should have as nearly as possible the characteristics and properties which are required of standards of length and mass-i.e., as nearly as possible unalterability with age, convenient electrical magnitude for practical measurement, and furthermore all