BAROMETRICAL MEASUREMENT OF HEIGHTS. 



409 



Example. 



Upper Station 



Thermometer in open air, I' = 70.4, 

 Attached -Tliermometei-, 

 Barometer, 

 Latitude of the place 



B = 0.00031 



log /3' = L37401 



1.37432 



log ^ = 1.47784 



D = 0.10352 



Lower Station. 



t = 77.6. 

 r' = 70.4, r = 77.6. 



^' = 23.66 inches, /3 = 30.05 inches. 

 cb = 21°. 



log D = 9.01502 



C =: 0.00087 



A = 4.81940 



^83529 



= 6843.7 English feet. 



D 



69 



