TABLE 54. 



ZONAL HARMONICS.* 



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



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

 and Magnetism," vol. ii., part 2. 



SMITHSONIAN TABLES. 



40 



