356 



On Ilypsometrical Measurements. 



[No. 4. 



corresponding* corrections in feet, to be added to, or subtracted 

 from, the altitudes derived from observations at the upper station 

 only, by means of the tables and formulae. 



(1) 



12) 



(3) 



(4) 



(5) 



(6) 

 Correc- 





Height of ba- 



Mean 



Correc- 



Mean height 



tion ac- 



Lat. 



rometer, equal 



height of the 



tion ac- 



of barometer 



cording 



to 30iu. in lat. 



barometer 



cording to 



from Dr. G. 



to Dr. G. 





45°. 



fromMunke 



Munke. 



Bird. 



Bird. 





in. 



feet. 



in. 



feet. 







30.079 



29.930 



— 129.8 



29.930 



— 129.8 



10 



30.074 



29.935 



-121.3 



29 975 



— 86.5 



20 



30.060 



29.950 



— 96.8 



30.064 



+ 3.2 



30 



30.039 



29.972 



— 59.2 



30.108 



+ 59.8 



40 



30.014 



29.999 



— 13 2 



30.019 



+ 4.4 



45 



30.000 



30.013 



+ 11.4 



30.000 



0.0 



50 



29.986 



30.027 



+ 35.9 



29.968 



— 15.7 



55 



29.973 



30.041 



4- 60.2 



29.919 



— 47.4 



60 



29.961 



30.054 



+ 81.9 



29.803 



— 138.3 



65 



29.949 



30.066 



+ 101.8 



29.609 



— 299.8 



70 



29 940 



30.076 



+ 119.5 



29.740 



— 175.4 



80 



29.926 



30.091 



+ 143.9 







* These corrections are in some cases very different, but those in column (6) 

 are probably in general the most trustworthy,-as best agreeing with the observa- 

 tions of Schouw, Sir J. Herschcl, Sir James Ross, &c. See Daniell's Meteorology, 

 (Ed. 1845) vol. I. pp. 132, 133. 



