OF THE RIVER SETLEJ. 



415 



Table of the Observed Correspondences of the Temperature of Boiling Water with the 



Indications of the Barometer. 



Observed 



Observed 1 



Temp, of 



liar, reduc- 



Bar. Cor. for 



Dolt oil's Tent. 



Error of, Obsd. Kg. Pt. Cor. 

 Scale. \for error of Scale. 





Bg. Pt. 



Barometer | 



liarom. 



85 1 



ed to 54° 

 •27,76 



Diam. Tube 



of Steam. 





210,00 



■n ,t>u 1 



27,71 



207,b»5 



2,05 



207,86 





207,38 



26,41 1 



82 



2633 



26,28 



205,28 



2,10 



205,16 





207,25 



26 33 



71 



26 28 



26,23 



205. 1 9 



2,06 



205,03 





206,50 



25,87 



79 5 



25,80 



25,75 



201,27 



2,23 



204,26 





205,9 > 



25,60 



83 



25,52 



25,47 



203,73 



2,17 



203,64 





205,40 



25,25 



74 



25,20 



25.15 



203,10 



2,30 



203,13 





204,85 



24,86 



62 5 



24,84 



24,79 



202,38 



2,49 



202,56 





204,25 



24,69 



65 



I 24,66 



24,61 



202,00 



2,25 



201,94 





204,00 



24,60 



89 



24,51 



24,46 



201,69 



2,31 



201,69 





198,15 



21,71 



6) 



21,68 



21,03 



195,89 



2,26 



195,72 





188.50 



17.39 



42 



\ 17,41 



1 17,36 



1 85,90 



2,60 



1 85,95 





Table of the Error of the Thermometric Scale. 



Obsd. B. P 



Error 



Obsd. B. P. 

 — 197 



Error. 



Obsd. B. P | 



Error. 



188 



•Z £>o 



2 44 



206 ! 



2 26 



189 



2 54 



198 



2 43 



207 1 



2 23 



190 



2 53 



199 



2 41 



208 



2 20 



101 



2 52 



200 



2 39 



209 



2 17 



192 



2 51 



201 



2 37 



210 



2 14 



193 



2 50 



202 



2 35 



211 



2 10 



194 



2 49 



203 



2 33 



212 



2 06 



195 



2 47 



204 



2 31 



213 



2 02 



196 



2 46 



205 



2 29 



214 



1 98 



The full amount of the correction due to the temperature of the air has 

 been applied. To obtain the mean temperature of the column, I have cal- 

 culated that, at the level of the sea, from the observed temperature and the 

 approximate height, allowing a change of 1° for every 300 feet of Elevation. 

 The correction is obtained by the formula JisTT. H. in which T. is the mean 

 temperature and H. the approximate elevation. 



12. In forming the section, I have been doubtful as to the method I 

 ought to follow, whether to give an orthographic projection of the several 

 points supposed to throw off perpendiculars on a plane assumed in posi- 

 tion, or to constitute the several lines of route the intersections of the 

 planes of projection with the surface. Though preferring the former for 

 some reasons needless to mention, I have chosen to adopt the latter as 

 most conformable to the examples hitherto given of sections. My lines 



