siee 



Professor Kaemtz on the more important 



Although the continuations of these measurements probably 

 alter somewhat these quantities, and render less considerable 

 the still existing anomalies, yet this table shews the opposition 

 of the south-east and north-east winds, not only in reference to 

 the mean height of the barometer during different winds, but 

 also in regard to the changes during the day. 



The ground of these phenomena is simple. Supposing that 

 a north-east wind blows, a low temperature is, for the most part, 

 combined with it, and thus the barometer is high. But when 

 the wind veers gradually to the east, the temperature is increas- 

 ed, and the barometer consequently sinks. Even on the day 

 when the NE. blows, this depression can be recognised, and 

 hence the pressure of the air is somewhat less in the evening 

 than in the morning. As the wind in its further progress to 

 SE. passes S. and SW., the temperature becomes gradually 

 higher, the barometer sinks during the whole time, and hence 

 always stands lower in the evening than in the morning, until 

 at length during the prevalence of the SW. wind, the air ac- 

 quires its highest temperature, and the barometer attains its 

 lowest point, and thus the latter remains during the day pretty 

 stationary at the same height. But when the wind veers gra- 

 dually to the west and north, the temperature becomes lower 

 and lower, and thus the mercury rises ; a fact which may be 

 observed, not only in the mean height during individual winds, 

 but also in the change during the day, until at last, during the 

 NE., the extremes of temperature and of pressure of the air are 

 reached, when the preceding circle of changes is again renewed. 



Almost all changes of the barometer may be explained in the 

 manner pointed out above, if we regard the instrument as a 

 differential thermometer. Hence, to adduce one other fact, 

 the variations of the pressure of the air between the tropics are 



