244 On the Inland Storms ofTartary. [No. 3. 



S. E. It will be seen by looking at the wind card, that supposing the 

 wind due S. E. throughout the storm, it may be part of a great circle 

 of wind and if it veers at all, that, as we shall shew presently below, it 

 must be travelling along on a certain track. 



8. For : make a mark with a fly on a sheet of paper to represent 

 the place of observation. 



Place the horn card with the point marked E. N. E. upon the flag. 

 This is we will suppose the state of things when the E. N. E. wind is 

 rising to the strength of a gale. 



9. Now move the card gradually over the flag to the left till the 

 S. E. point is over it, and it will be seen that the wind has gradually be- 

 come E. b. N., East, E. b. S., E. S., E. S. E. b. E. and S. E. and that 

 such veering of the wind indicates a circular storm moving up from E. 

 b. S. to W. b. N. In such a case the greatest violence will be felt 

 and the Barometer will be lowest when the wind is about E. b. S. 

 because then the centre is nearest. 



10. Again : put the card at the S. E. wind-point over the flag and 

 move it up to the right till the N. W. wind-point comes over the flag. 



Now, at half-way you will see that the flag is at the vacant space in 

 the centre of the card. This is the centre of the hurricane f in which, 

 between the Tropics, there is most frequently a dead calm before the 

 shift, but often none ; and the wind shifts or veers very rapidly to the 

 opposite quarter or thereabouts, and blows as hard as ever. 



11. This is the case of a storm moving up from the S. W. to the 

 N. E. and its centre passing exactly over you. 



12. We do not know that all or any part of this will occur, but it 

 is easy to know if it does, if the veering of the wind be registered ; 

 and at the same time the Barometer, or Simpiesometer, or both. I give 

 now two suppositious registries of storm days, such as would be inva- 

 luable to us. 



No. I. 



September loth, 1847- — At 9 a. m. encamped at Chuen-lung, the 

 guides predicting a storm. 



Secured every thing. My tent between two rocks just at the 

 entrance of a little defile, whence a good view of the plain to the east, 

 south, and round to N. W. and by a few paces round the rock the 

 rest of the horizon could be seen. 9} a. m. wind E. N. E. Bar. 



