CONTENTS. 



Introduction 



PAGE 



vii 



Part I. — ASTRONOMICAL OBSERVATIONS. 



Introductory remarks ....... 



Note on reduction of astronomical observations 



Geographical positions, record, and results . . , . 



Observations for latitude of Port Foulke, Smith Strait 

 Observations for longitude of Port Foulke, Smith Strait 

 Geographical positions, continued ..... 



Survey of Smith Strait ...... 



Geographical positions, continued ..... 



Pendulum experiments. Harvard Observatory, Cambridge, Massachusetts 

 FormuliB and method of reduction ..... 



Observations for local time. Port Foulke 



Pendulum experiments. Port Foulke ..... 



Bearing of pendulum experiments on the value of the earth's compression 



Illustrated by a large track chart, showing the region of Dr. Kane's and Dr. Hayes' 

 explorations, newly constructed from additional materials collected by Dr. Hayes 

 in 1860 and 1861 .....••• Title page 



Also illustrated by a smaller chart of the vicinity of Port Foulke, from surveys by 



Dr. Hayes . . . • • • ... . .10 





1 





2 





3 





9 





10 





19 





23 





26 





29 





33 





3T 





42 





68 



Part II.— MAGNETIC OBSERVATIONS. 



Introductory remarks .... 

 Differential declination observations at Port Foulke 

 Diurnal variation of declination 

 Determination of magnetic declinations 

 Determination of magnetic intensities . 

 Determination of magnetic inclination . 

 Remarks on the aurora borealis 



Illustrated with a diagram of the diurnal variation and a chart showing the iso-mag- 

 netic lines for the vicinity of Smith Strait 



T3 



74 

 T9 



83 



92 



lOT 



112 



112 



Part III. — TIDAL OBSERVATIONS. 



General account of observations and description of gauge 



Record of observations ••.... 



Determination of the mean level of the sea 



( iii ) 



115 

 116 

 132 



