Matthew Fontaine Maury,
Physical Geography of the Sea and its Meteorology
(1864)
“ The polar calms and the return current.—Entering the polar regions obliquely, it is pressed upon by similar particles flowing in oblique currents across every meridian; and here again is a calm place or node; for, as our imaginary particle approaches the parallels near the polar calms more and more obliquely, it, with all the rest, is whirled about the pole in a continued circular gale; finally, reaching the vortex of the calm place, it is carried upward to the regions above, whence it commences again its flow to the north as an upper current, as far as the calm belt of Capricorn ”
