PART II. Pnl.AU MAGNETIC PHKNOMKNA AND TERRKI.LA KXPKRIMKMS. (HAP. II. 



Comparison between calculated and observed fields of force. 



Chart I: A," = 75, * = 4 km, i = 625 ooo amp. Chart II: February 15, 1903, i'> p.m. Or. M. T. 



437 



Fig. 1 86. 



