TABLE OF CONTENTS. 



CHAPTER I.— SxjkveyingJthe Route 



Selection of Route 



Soundings 



Tubes and Sinkers 



Original Silvertown Machine 



Lucas' Sounding Machines ... 



Johnson and Phillips' Sounding Machine 



Lucas' Snapper 



Observing Sea Temperature and Pressure 

 Ship's Position and Speed ... 



Thomson's Tubes 



James' Submarine Sentry ... 



1 



2 



4 



9 



12 



16 



18 



20 



29 



33 



34 



CHAPTER 11. — Pbinciples of Design and Constrtjction. 



Principles of Design ... ... ... ... ... ... ... 37 



Speed of Signalling ... ... ... ... ... ... ... 38 



Speed Constant ... ... ... ... ... ... ... 41 



Temperature Variation of Copper ... ... ... ... ... 44 



Pressure Variation of Gutta Percha ... ... ... ... 47 



Temperature Variation of Gutta Percha ... ... ... ... 47 



Quality of Gutta Percha ... ... ... ... ... ... 49 



Weights of Copper and Gutta Percha ... ... ... ... 51 



Capacity per Naut ... ... ... ... ... ... ... 54 



Core Dimensions ... ... ... ... ... ... ... 59 



Best Proportions of Copper and Gutta Percha 60 



Clark's Segmental Conductor ... ,,. ... ... ... 62 



Siemens Solid Strand Conductor ... ... ... ... ... 63 



Conductivity Measurements ... ... ... ... ... ... 64 



Temperature Coefficient for Gutta Percha ... ... ... 68 



Collection and Supplies of Gutta Percha ... ... 69 



Species of Gutta Percha (Charles Bright, F.R.S.E.) 70 



Preparation of Gutta Percha ... ... ... ... ... 71 



Protection against Teredo ... ... ... ... ... ... 72 



Bright and Clark's Compound ... ... ... ... ... 72 



Sheathing and Outer Serving ... ... ... ... ... 73 



Tensile Strength of Sheath ... ... ... ... 75 



