X CONTENTS 



CHAPTER VT p.ok 



Running Survey - - - - - - - 17-4 



Modified Running Survey — Sketch Survey by Compass Bearings 

 and Vertical Angles. 



CHAPTER VII 



COAST-LTNINO - - - - - - - -185 



CHAPTER VIII 

 Sounding ........ 194 



Boat Sounding — Ship Sounding — Searching for Vigias. 



CHAPTER IX 

 Tides 219 



Automatic Tide-Gauge — Tidal Diagrams and Approximate^ I'redic- 

 tions of Tides — Admiralty Method of Discussion of Tidal Obser- 

 vations — Tidal Streams and Surface Currents — Mean Sea Level 



CHAPTER X 

 Topography - - - - - -- -251 



CHAPTER XI 



Heights ..---..-- 25'' 

 By Theodolite — By Sextant — Obtaining Distance from Elevation 

 of a known Height — LcvelUng. 



CHAPTER XII 

 Observations for LAxiTrDE ...... 271 



By Circum-meridian Altitudes of Stars — By Circum meridian 

 Altitudes of Sun. 



CHAPTER XIII 

 Observations for Error of Chronometer - . - - 2D2 



C4eneral remarks on obtaining Longitude — Chronographs for Use in 

 the Field — Error by Equal Altitudes — Sextant Observation ■. for 

 Time at an Observatory — Errors by Two Stars at Equal Alti- 

 tude. 



