874: Mr Lawson on the Trade-Winds of Bar badoes. 



aceelef atd the velocity of the air ildlvitig frottt th^ NW. which 

 lies immediately to their south. 



62. It is also dlear that the ait- to the NE; of the liiie ef 

 least pressure iti the NW. current being directed towards 

 that line, within the limits of the storm, instead of flowing oil 

 parallel to it, tb triangular space ^i\\ exist in this eurt'ent 

 similar to that in the trade-wind (58), in which there can be 

 iio decided breeze, only, it will lie between the SE. ahd N. 

 points of the compass, instead of between the 8W. and E. 

 points, as in the latter. In the SW., owing to the deficiency 

 of pressure within the Storin, the direction of the current 

 will be gradually brought to WNW., and more to the south 

 even to W. 



63. As soon as the NW. current begins to be felt on the 

 earth's surface, it Will drive off the still air from the space 

 A C B, Fig. 2, and elongate the storm to the SE., and at last, 

 hs its force becomes spent, will glide above the lowest stl*a- 

 tiim of air, which here, owing to the difference of pressure 

 Withiii and around the storm. Will have a tendency to flow in 

 the opposite direction, viz., towards its centre. 



64. By referring to Fig, 2, it will be seen that the NW. 

 cuh^ent only partly occupies the triangular space (58) left 

 vacant by the trade-wind, the 8W. or returning equatorial 

 current, which is itsually found immediately above the NW. 

 one (il), being deprived of its usual support, is deflected 

 downwards, and experienced bvei* the ^pace unoccupied by 

 the lower currents with all its violence. Within the limits 

 of the storm, the air to the westward of the line of least 

 pressure in this current, will flow towards that line, as in 

 ihe trjlde-winds and NW. currents, coming to the WSW. 

 and W. Along the east side, tod, the air will have its 

 easterly motion diminished, and the wind will back round 

 from SW. to SSW., or S. This equatorial cul^rent, fls it aj)- 

 proaches the southern margin of the deflected portion of the 

 trade-wind (58) extending from D towards 0, Fig. 2, will at 

 first tend to drive it back, but towal*ds the eastern margin of 

 the storm, the great inequality of the atmospheric pressure, 

 within and around it, will ultimately cause the air of the 

 lower stratum to insinuate itself under the equatorial cur- 



