54 Table 31 . 



ZONAL HARMONICS.* 



The values of the first seven zonal harmonics are here given for every degree between = o° and 9 = 90". 



* Calculated by Prof. Perry (Phil. Mag. Dec. 189 1)- See also A. Gray, " Absolute Measurements in Electricity 

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



Smithsonian Tables. 



