of Heights by the Barometer. 405 



6, 6' denoting the temperatures of Fahrenheit's thermo- 

 meter. 



In this manner the following Table has been calculated, the 

 corresponding absolute temperature, pressure, and density at the 

 level of the sea being taken each as unity: — 



Table II. — Showing the Decrease of Temperature, Pressure, 

 and Density in the Atmosphere at different altitudes. 



Partially clear sky. Overcast sky. 









i 



Height deduced 

 by the method 

 of quadratures . 





Pressure 



of moist 



air. 



Pres- 

 sure 

 of va- 

 pour. 



Density 



of moist 



air. 



Height deduced 

 by the method 

 of quadratures. 









Tempe- 

 rature. 



Pressure 



of moist 



air. 



Pres- Density 

 sure of of moist 

 vapour. air. 



Without .T akin S 

 consi- intocon- 

 dering « de ™" 

 the vari- hon ^ e 

 ation of variation 



Tempe- 

 rature. 



1 

 Without Taking 

 consi- intocon- 

 dering s . ldera " 

 the vari- tl0n the 

 ation of .variation 









gravity. °* 



gravity. 











gravity. °* 

 ° J ; gravity. 



! in. I 



ft. ft. 





in. 





1 



ft ft 



1-0000 1 0000 0-39 1-0000 



10000 1-0000 0-48 ; 1-0000 



ii. i it. 







0-9863 0-9648 0-33 0-9788 



1,002 1,002 0-9914 0-9649 0-41 0-9739 



1002 1002 



0-9763 0-9305 030 0-9540 



2,001 2,001 0-9835 0-9308 0-35 0-9476 



2002 2002 



0-9675 0-8971 0-25 0-9286 



3,000 3,000 0-9757 0-8976 0-31 0-9215 



3003 3003 



0-9610 0-8648 0-22 0-9013 3,994 3,995 0-9686 8653 0-27! 0-8952 



4005 4006 



0-9559 0-8335 0-18 0-8738 4,987 4,988 0-9628: 0-8341 0-25 0-8683 



5002 5003 



0-9506 0-8032 0-16 0-8469! 5,978 5,980 











09453 0-7737 014 0-8206 6,974 6,976 













0-9401 0-7453 Oil 0-7951 7,9f)4 7,967 













0-9352 0-7177 0-09 0-7700' 8,957 8,961 













0-9303 0-691 1 008 0-7454' 9,945 9,950 













0-9253 6652. 0-07 0-7215, 10,939 10,945 













0-9204 6402' 06 6982 11,931 11,938 













0-9156 0-6161 0-05 06754 12,919 12,927 













0-9114 0-5928 0-06 0-6527:13,907 13,916 













0-9074 0-5703 005 ! 0-6309 14,894 14,905! 













0-9035 0-5486 004 06096! 15,879 15,891 i 













0-8997 0-5277 0-03 5890 16,861 16,875 













0-8964 0-5076,0 015 0-5688 17,839 17,854 















0-8930 0-4879 002 0-5487 18,832 18,849 















0-8902 0-4694 0-02 5296 19,798 19,817 















0-8877 0-4515 002 j 0-5108 20,767 20,788 















0-8833 0-4338 001 0-4934 21,760 21,783 















0-8S14 0-4172 0008 0-4756 22,725 22,750 















0-8789 0-4011 ... |0-4586 23,696 23,723 















0-8769 0-3857 1 ... 



0-4420 24,659 24,688 















0-8750 0-3709! ... 



0-4260 25,619 25,650 















0-8731i 0-3566 ... 



0-4105 26,582 26,616 















0-8713' 0-3429 ... 



0-3954 27,539 27,575 















0-86980-3297 ... 



0-3809 28,497 28,536 















0-8670J 0-3167 ... 



0-3671 29,476 29,518 















In calculating the first and second columns, the absolute tem- 

 perature and the pressure at the level of the sea were assumed to 



