Pacific, Atlantic and Indian Oceans, mean directions and velocities of their stream and drift currents compiled by Commander C H Simpson RN

Scale: circa 60m at 0 degrees. Four insets: 1) Lines of equal temperature of the surface water for February; 2) Lines of equal temperature of the surface water for August; 3) Indian Ocean, China and adjacent seas:- supplementary chart of the currents during the NE monsoon; 4) Currents N of Equator July to December