54 TABLE 31 . 



ZONAL HARMONICS.* 



The values of the first seven zonal harmonics are here given for every degree between 6 = o and = 90. 



* Calculated by Prof. Perry (Phil. Mag. Dec. 1891). See also A. Gray, "Absolute Measurements in Electricity 

 and Magnetism," vol. ii., part 3. 



SMITHSONIAN TABLES. 



