58 Description of the Mounlain Barometer, 



Example second. 



Observation at bcttbm 30*017 Thertn. M'dif" 60** 



., at top - 29 334 Therm, m air 37 



2 I 59-331 

 Mean - 29*773 

 Difference 4*83 

 Value of a tenth by 

 • the table 



} . ^^*' 



330*0 

 70-00 



2-623 



Approximate height - ^422*623 

 Ditto by G. Shuckbiirgh ~422*9 



Error 



00 3 



2 = 



Correction for. Temperaiure. 

 For 24° = 6 hundredths - - 

 2 four hundredths - 

 1* eight hundredth - 



Correction + 

 Ditto by sir G, S. 



Error 



i!];^: 



23*3 

 2*0 

 0-3 



27*8 

 27-2 



0*6 



Approximate height by nje 422-6 

 Correction for temperature + 27-8 



By sir G. S. 422*9 



27*2 



430-4 



430-1 



These two examples show how near the truth tlie method 

 here recommended will come, even in considerable heights.; 



It has- been already observed, that in observations made 

 with the barometer I have described, a small correction is 

 necessary on account of the rise of the mercury in the cis- 

 (ern^ as the barometer falls. Altitudes being in all cases 



measured 



