NA VIGA TION. 93 



of Sumner's method, from seeing the valuable 

 results of the skilful use made of it by Captain 

 Moriarty, R.N., in the Atlantic cable expeditions 

 of 1858, 1865, and 1866, and particularly in finding 

 the places for the successive grapplings by which 

 the lost 1865 cable was recovered and completed 

 in 1866, I have long felt convinced that it ought 

 to be the rule and not the exception to use 

 Sumner's method for ordinary navigation at sea. 

 I have therefore prepared tables, copies of which 

 I hold in my hand, for facilitating the practice 

 of Sumner's method at sea, and have had them 

 printed and "stereotyped for publication. The pub- 

 lication only waits the preparation and printing of 

 the pamphlet of rules and illustrations to explain 

 how they are to be used. 1 



The practice of Sumner's method for star ob- 

 servations is even more valuable than for the 

 altitudes of the sun taken by day. By taking 

 the altitudes of two stars at the same time, or 



1 The pamphlet of rules and illustrations is now (April, 1876) in 

 type, and nearly ready for press. It will, with the stereotyped tables, 

 be published in the course of a few weeks by Messrs. Taylor and 

 Francis, London. 



