264 On Dust Whirlwinds and Cyclones. [No. 3. 



On Dust Whirlwinds and Cyclones. By P. F. H. Baddely, Esq. 

 M.D. ; B. Arty. Lahore. 



" Who holds the furious storms in straiten'd reins, 

 And bids fierce Whirlwinds wheel his rapid car?" 



Young. 

 (Continued from page 147.) 



The Cyclone Compass, invented during the early part of December 

 last, is intended to facilitate navigation in rotatory storms or Hurri- 

 canes. 



The principle of its construction, is similar to that of the transpa- 

 rent Hurricane cards, invented by Sir William Reid, now in general use. 



The chief advantage supposed to be connected with the Compass, 

 is the facility with which it may be used even by persons unacquainted 

 with the Law of Storms ; a mere glance at the Compass, in whatever 

 way placed, being sufficient to discover the bearing of the centre, and 

 the ship's relative position, in a Hurricane. 



One instrument answers for both Hemispheres, and as it carries a 

 magnet, which points North and South, it may serve for a compass to 

 steer by — and by a slight modification of the present ship's Compass, 

 it may be made to combine both uses in the same instrument. PI. 1 . 



Another important advantage, is the rotatory and progressive mo- 

 tions that may be imparted to it, similar, it is believed, to the move- 

 ments of the Cyclones themselves — by which means, the exact posi- 

 tion and veerings of the winds all round the storm's circuit, may be 

 accurately noted, and transferred to paper. 



So that by its use, a more precise comprehension of the character of 

 these rotatory storms may be acquired, and their study rendered inter- 

 esting, by the probability that the nature of the laws that regulate 

 them, hitherto apparently so complicated and inexplicable, may, by 

 the new light thrown upon them, be better understood. 



The accompanying plates 7 and 8 of Cyclone courses, are intended 

 to shew what the instrument is capable of effecting, and that by its 

 means Cyclone courses for every point in the compass, in the Northern 

 and Southern Hemispheres, may without difficulty be drawn for the 

 purpose of being used as charts of reference. 



The motions of the sea, may likewise, by its means be studied with 

 equal facility and interest. Vide Plates 9 and 10. 



