154 



OBSEEVATIONS ON THE WINDS 



illustrating Captain Toynbee's monthly discussion of the winds between 

 10° S. and 20° N., and from 10° to 40° W. (62), pp. 136—140, will serve to 

 assist the seaman in quickly finding the latitude in which he may expect 

 to fall in with these troublesome winds. In the Chapter on Passages, the 

 routes recommended for Crossing the Equator will be found. The follow- 

 ing approximate estimate of the breadth of this Calm Belt is derived from 

 Maury's Trade Wind Chart, &c., and given in the Hydrographic Office 

 Pilot Charts, and also by Dr. Van Galen.* It is of course in a measure 

 superseded by the work of Captain Toynbee, mentioned above, but is given 

 here, as it may be useful taken in connection with that work, in showing 

 the amount of rehance which may be placed on these deductions : — 



TABLE of Ihe Average Extent of the Equinoctial Calms. 



This Table will show that, during the winter months, and in the Western 

 part of the ocean, the limits of the Trade Winds (as given in the Table) 

 approximate, and leave no interval of Calm. In the Northern summer 

 months, however, the Calm Belt is much more distinctly marked, although 



"Zeil, Wind, en Stroomkaarten Toegelicht," door Dr. P. van Galen. Rotterdam. 



