CONTENTS 



PAGE 



Preliminary .--.-.--1 



CHAPTER I 

 Instruments and Fittings ..---- 5 

 Sextants and Stands — Horizon — Theodolite — Station Pointer^ 

 Scales — Straight-edges — Chains — Protractors — Pocket 

 Aneroids — Heliostat — Ten-foot Pole — Range-finder — 

 Drawing-Boards — Weights — Transfer Paper — Paper — 

 Books — Chronometers — Marks — Boat's Fittings — Lead- 

 lines — Beacons. 



CHAPTER II 

 A Marine Survey in General - - - - - 59 



CHAPTER III 

 Bases ...-...-. G6 

 By Chain — By difference of Latitude — By Mast-head Angle — By 

 Angle subtended by known length — By Range-finder — By 

 Measured Rope — By Sound. 



CHAPTER IV 



The Main Triangulatiox - - - - - - 78 



General — Making a Main Station — False Station — Sketch — Con- 



vergency — Calculation — -Co-ordinating Astronomical Observa- 

 tions with Triangulation. 



CHAPTER V 

 Plottino. - • - - - - - - 118 



Irregular method of Plotting — Examples — Fixing Marks — Calcu- 

 lating a po.sition from two Angles to three known Objects — 

 Drawing Rectangular Lines. 



is 



