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Chemical and Physical Notes 



TABLE XIX. Giving Results of Observations of the Temperature 

 of the Air and its Variations at St Moritz. 



than the thermometer. Taking even the lowest of these values, we see 

 how great the possible error is in measuring the actual temperature of 

 the air at any moment with a thermometer, and the error is the greater 

 the more sluggish the instrument is. In Table XX the detailed observa- 

 tions are given for a few minutes on the 26th of February, when the 

 temperature was changing very rapidly. In the third and fourth columns 

 the rise or fall of the observed temperature is given. In the fifth and sixth 

 columns the corresponding differences between the temperature of the air 

 and that of the thermometer which would cause the observed rate of 

 change of temperature are given ; with these and the observed tempera- 

 tures we obtain the amended temperatures of the seventh column. 

 Although it was snowing on the 26th, the air was perfectly still, and 

 the rate of cooling corresponding to the 'term' eighty seconds has been 

 applied. Had the rate of cooling of the thermometer in the still air of 

 a room been taken, the difference between amended and observed 

 temperatures would have been nearly twice as great. 



"Characteristics of Fohn Weather. These observations show how 

 rapidly the temperature of the air may vary even in ordinary weather. 



