RUSSIAN BAEOMETER. 



A i.EGULAR system of Meteorological Observations has been established by order 

 of the Russian government throughout the extensive regions placed ucider its sway, 

 and a vast amount of observations made in Europe, in Asia, and in North America 

 have already been published. The scale of the barometer employed in this system 

 is divided in units, each of which is equal to one half of a Russian, or English 

 decimal line, that is, 1 r= 0.05 of an inch, 600 half-lines of the Russian Barometer 

 being = 30 inches of the English Barometer. 



The conversion of this scale, which is the English scale, slightly modified in its 

 form, is easy. It suffices to divide the Russian heights by two, and to put back, by 

 one figure, the decimal point, in order to have them converted into English inches 

 and decimals. This transformation is so easy to effect, that a peculiar table for it 

 would seem superfluous. 



The normal temperature of the standard being the same as that of the English, 

 that is, 13°| Reaumur, or 62° Fahrenheit, the reduction of the Russian -Barometer 

 to the freezing point can be made by means of the table for reducing the English 

 Barometers. But the attached thermometer being that of Reaumur, its indications 

 must be first converted into degrees of Fahrenheit. 



Tables VII. and VIII., which follow, have been computed in order to render more 

 easy the comparison and the use of the Barometrical Observations recorded in the 

 large collection, published annually by order of the Emperor of Russia, under the 

 name of Anniiaire MeUorologique et Magnetique du Corps des Ingenieurs des 

 Mines. 



45 



