BAROMETRICAL MEASUREMENT OF HEIGHTS. 4Q1 



Example 1. 



Suppose to be given, 



B = 333.6 Paris lines ; T = + 17.0 Reaumur ; * = + 19.0 R. ; <j> = 48. 

 B' = 289.9 Paris lines ; T' = + 16.3 Reaumur ; t' + 15.2 R. 

 T T' = 0.7 t + t 1 = + 34.2 



r = + 8.55 



In Table II. with B take H = 864.9 

 with B' take H' = 291. 2 



H H' = 573.7 -fir"- 5 ' 737 



H H' T=+8.55 



H 100 H r= 49.06 







u = 622.06 



In Table III., with u and r, take C = +1.8 

 In Table IV., with u and <, take C' = 0.2 

 In Table V., with T T' and r take C" = 0.0 



Difference of elevation, or h = 623.66 toises. 

 Gauss's Tables give 623.64 toises. 



Example 2. 



Suppose to be given, 



I = 342.68 Paris lines ; t = 10.38 Reaumur ; = 65. 

 V = 285.47 Paris lines ; t' = _14^94 Reaumur; T T' = 0. R. 

 t + t> = 25.32 

 T = 6.33 



In Table II. with 5 take H = 974.58 

 " with V take H' = 228.28 



H H' = 746.30 ~io/' = 7 



H H' T = -_ 6 j33 



W - 699.06 E-H' T J^f 



In Table III., with ti and r, take C = +1.8 

 In Table IV., with u and <, take C' = 1.2 



h= 699.66 



Gauss's Tables give h = 699.72 toises. 



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