IS 



.M A Q N E TIC S D R V E V O V V E N N S V I- V A N 1 A . 



X=X + x + x dL + ydMcos L -f zdL dMcos L + pdL 2 + qdlP cos 2 L 

 dL =Lat. — 4P.34 



dM = Long. — 71.45. 



Forming the conditional and normal equations, we deduce: — 

 X 3.920-0.1936 dL + 0.0146 dMcoa L + 0.0203 dL dMcos L -0.01587 dL 2 



-0.0005 dJiPeos 2 L. 

 li is. however, preferable to shorten the formula, and use instead, the following: — 

 X 3.900 — 0.193-1 dL + 0.0134 dMcos L \- 0.02 dL dMcos /.. 





