

TABLE OF CONTENTS. 



SECTION I. 



INTRODUCTION. 



PAGE 



Introductory remarks ..... .... 1 



Plan of observation .......... 1 



Instruments employed .......... 2 



SECTION II. 



DESCRIPTIONS OF STATIONS. 



Philadelphia . . . . . . . . .' . .4 



Gosport ............ 4 



St. Thomas ........... 5 



Isle Royal ........... 5 



Ceara ............ 5 



Pernambuco . . . . . . . . . 6 



Bahia ............ 6 



Rio Janeiro . . . . . . . . . . . ' C 



Monte Video . ......... 1 



Sandy Point ........... 8 



Valparaiso . . . . . . . . . . .9 



Callao ............ 9 



Payta ............ 10 



Panama. . . . . . . ., . ,,10 



Acapulco . . , . . . . . . .11 



Magdalena Bay . . . . . . . . . . .11 



San Francisco ........... 12 



SECTION III. 



ASTRONOMICAL OBSERVATIONS. 



General remarks . . . . . . . . .13 



Observations of the sun for latitude ........ 13 



Observations of the sun for time ........ 14 



Mode of determining true bearings . . . . . . .26 



Observations of the sun for the determination of true bearings 



Triangulation at Ceara ........ 32 



Table of observed latitudes ..... 34 



Errors of pocket chronometer, Fletcher, No. 906 . . . . .35 



Chronometer comparisons ..... 



True bearings of objects used as azimuth marks .... 



(iii) 



