133 



II. REDUCTION OF THE ABSOLUTE AND RELATIVE MAGNETIC 



OBSERVATIONS. 



BY 



COMMANDER L. W. P. CHETWYND, R.N. 



TABLE OP CONTENTS. 



Page 



Section I. Introduction. Comparison of results at Absolute Hut and at Icj Station, McMurdo Sound 133 



II. Horizontal Force results at Absolute Hut 135 



III. Inclination results at Absolute Hut 135 



IV. Declination results at Absolute Hut 138 



V. Horizontal Force, Inclination and Declination results at Ice Station, McMurdo Sound . . 141 



VI. Inclination, Total-Force and Declination results during south-eastern sledge journey . . 141 



VII. Results at Cape Crozier, Cape Adare, and Falkland Islands 142 



,, VIII. Inclination, Total Force and Declination results during western sledge journey 143 



IX. Inclination results from observations at sea, January and February, 1902 144 



X. Inclination results from observations at sea, February and March, 1901 147 



XI. Declination results from observations at sea 150 



XII. Declination results from observations on shore during sledge journeys 154 



XIII. Determination of the position of the South Magnetic Pole 155 



XIV. Comparison of results with those given by SABINE 156 



SECTION I. 



THE observations considered in this paper comprise : 



Observations made at Winter Quarters, by Mr. L. C. BERNACCHT. 



Observations made during south-eastern sledge journey, by Mr. L. C. BERNACCHI. 



Observations made at Cape Adare, Cape Crozier, and Falkland Islands, by Mr. L. C. BERNACCHI. 



Observations made during western sledge journey, by Lieutenant A. B. ARMITAGE, R.N.E. 



Observations for Inclination, made on board the " Discovery " at sea, by Lieutenant ARMITAGE and 



Mr. BERNACCHI. 



Observations for Declination, made on board the " Discovery " at sea, by Lieutenant ARMITAGE. 

 Observations for Declination, made on shore, by Captain E. F. SCOTT, R.N., and other officers 



of the Expedition. 



Mr. L. C. BERNACCHI and Lieutenant A. B. ARMITAGE, E.N.R., by whom the observations were 

 principally made, had had previous experience in magnetic observation. 



The instruments with which the Expedition was furnished were lent by the Admiralty and comprised 

 the following : 



Two Unifilar Magnetometers, Nos. 25 and 36, by ELLIOTT BROS. 

 Two Inclination Circles, Nos. 26 and 27, by DOVER. 

 Two Lloyd-Creak Circles, Nos. 143 and 149, by DOVER. 

 Two Fox Circles, Nos. 28 and 29, by DOVER. 

 One Set of Eschenhagen Magnetographs. 



