43 



its shoalest spot. Another bank was discovered during the Discovery of a 

 year on the coast of Brazil by the Adams, Commander of Brazil. 

 Rodgers, aud Frolic, Commander G. B. White, while en- 

 gaged in searching for reported dangers to navigation. 

 The Essex, Commander Schley, ran a line of soundings 

 from Cape Henry to St. Paul de Loando, on the west 

 coast of Africa ; and theuce, via the Island of St. Helena, 

 to Cape Frio, Brazil. All soundings as soon as received at 

 the Office were entered on the charts affected by them. 



All this hydrographic work was simply incidental to the 

 regular naval duties of the vessels named, no appropriations 

 having been made for surveying purposes. 



The Huron, Commander Eyan, was employed in determin- Longitudes do- 

 ing the longitudes of places on the north coast of South tranVport in | 

 America and adjacent islands, by carrying chronometers c ronometers - 

 from well-established positions at Aspinwall and Port 

 Spain, Trinidad. The following positions were thus deter- 

 mined: Testigos Islands; Puerto Santo Bay; Pampatar, 

 Island of Margarita ; Cumana ; Tortuga Island ; Corsarios 

 Bay ; Orchla Island ; Los Roques Island ; La Guayra ; 

 Puerto Cabello; Island of Curacao; Vela de Cora; Orange- 

 Stadt; Estanquez Point; Bahia Honda; Cape La Yela; 

 Santa Marta, and Cartagena. 



The completion of the cable line from Lisbon to Brazil, 

 via Madeira and the Cape Verde Islands, and the -success 

 of former expeditions for determining longitudes by tele- 

 graph, induced the Navy Department to send out another 

 expedition to establish the positions of the principal ports 

 on the east coast of South America. It was decided that 

 the Royal Observatory at Lisbon should be the initial sta- 

 tion. On the 29th of October, 1877, the expedition again Expedition 

 under Lieut. Commander F. M. Green, sailed from New teSnininVionti- 

 Tork on the Guard, and arrived at Lisbon on the 30th of ^^ ^ te * e " 

 the following November. 



Sailing directions were published during theyear for " The publications of 

 Caribbean Sea and Gulf of Mexico, iucluding the Bahama tlie oace ' 

 and Bermuda Islands," compiled by Lieut. Commander F. M. 

 Green; "The English Channel;" for "The West Coast of 

 Africa from Cape Lopez to the Cape of Good Hope, includ- 

 ing the islands in the Bight of Biafra and the islands of St. 

 Helena and Ascension," translated and compiled by Lieut. 

 Commander J. R. Bartlett. 



