PREFACE. V. 



supplying me with illustrations and various informa- 

 tion : — Messrs. Siemens Bros, and Co., Woolwich ; The 

 India-Rubber, Gutta Percha and Telegraph Works 

 Company, Silvertown ; The Telegraph Construction and 

 Maintenance Company, Greenwich ; Messrs. Johnson & 

 Phillips, Old Charlton ; Messrs. Elliott Bros., London ; 

 The Eastern. Eastern Extension, and Eastern and South 

 African Telegraph Companies, the Commercial Cable 

 Company, &c. 



H. D. Wilkinson. 



Wimbledon, June, 1896. 



a2 



