Contributions to geomagnetic theory

Acknowledgements The number o f in d iv id u a ls and o rg an iz atio n s who c o n trib u te d to th e work d escrib ed in t h i s paper i s so la rg e th a t some must accep t the a u th o r's thanks w ithout s p e c ific mention h e re. He must, however, e s p e c ia lly thank Dr. S ta te U n iv ersity o f Iowa, f o r suggesting the to p ic d iscu ssed in th e second p a r t of th e paper, fa r supporting him l i b e r a l l y d uring th e performance of th e work, fo r giving him much m a te ria l h e lp , and fo r making arrangem ents fo r him to use the I EM 70h computer a t the General Motors T echnical Center and to have t r a j e c t o r ie s computed by M artin A ir c r a f t C orporation a t th e re q u e st o f RIAS, I n c. He f u r th e r espe­ S ta f f , D e tro it, M ichigan, fo r making th e General Motors IBM computer a c c e s s ib le to him, and to Mr. D. H art and perso n n el o f the Data Pro­ c essin g Group, General Motors Technical C enter, fo r in v alu a b le h elp i n programming and fo r o th er m a te ria l a id. He owes a d eb t of g ra titu d e to D rs. G. Q roetzinger and P. Schwed of RIAS, I n c ., B altim ore, Maryland, f o r t h e i r cooperation in obtained machine-computed t r a j e c t o r ie s f o r him. During th e e a rly p a r t o f th e time sp en t by th e au th o r on t h is p ro je c t …