Geographical Notes

Abstract

American Longitudes.—The United States Hydro-graphic Office is continuing the work of establishing secondary meridians of longitude by the electric telegraph. Lieut-Commander F. M. Green, U.S.N., with the same officers who have been engaged in similar work in the West Indies for some time past, has commenced the determination of South American meridians by measuring from the Royal Observatory at Lisbon through the cables of the Brazilian Submarine Company to Madeira and St. Vincent. The measurement will be continued by way of Pernambuco to Bahia, Rio de Janeiro, Buenos Ayres, and Valparaiso. The longitude of the Royal Observatory at Lisbon will shortly be determined with great exactitude by electrical measurement from London and Paris. The expedition has met with the most gratifying and cordial assistance from the officers of the Portuguese Government and the authorities of the telegraph companies.