BY THE BOILING POINT OF WATER. 



237 



simple law are given in the 6th column of the following Table. Column (7) gives 

 the temperature from M. Regnault's Table in the Annates de Chimie. 





Barometer 



corrected 



Temp. 







Reg- 

 nault's 

 Formula. 







Series. 



and reduced to 32°. 



Boiling 



Water 



Observed* 



Linear 

 Formula. 



Difference. 



Difference. 



Locality. 



Millim. 



Eng. Inch 



I. 



527-5 



20-79 



194-50 



194 ! 28 



+ 0-22 



194-18 



+ 0-32 



Col Collon. 



II. 



528-05 



20-79 



194-25 



194-33 



-0-08 



194-24 



+ 0-01 



Aiguille du Moine. 



II. 



569-0 



22-40 



197-90 



197-94 



-0-04 



197-78 



+ 0-12 



Breven. 



I. 



575-9 



22-67 



198-43 



198-51 



-0-08 



198-37 



+ 0-06 



St Bernard. 



I. 



588-1 



23-15 



199-45 



199-52 



-0-07 



199-39 



+ 0-06 



Tacul. 



I. 



593-2 



23-35 



199-95 



199-94 



+ 0-01 



199-80 



+ 0-15 



Do. 



I. 



606-9 



23-89 



200-93 



201-04 



-0-11 



200-90 



-0-03 



Prarayon 



II. 



609-3 



23-99 



201-15 



201-24 



-0-09 



201-07 



+ 0-08 



Montanvert. 



II. 



610-15 



24-02 



201-35 



201-31 



+ 0-04 



201-15 



+ 0-20 



Do. 



II. 



612.3 



24-105 



201-30 



201-47 



-0-17 



201-33 



-0-03 



Do. 



I. 



638-6 



25-14 



203-55 



203-51 



+ 0-04 



203-36 



+ 0-19 



Naversch (Gressonay.) 



II. 



675-0 



26-57 



204-60| 







• • • 





Chamouni. 



I. 



723-6 



28-49 



209-47 



209-54 



-0-07 



209-53 



-0-06 



Martigny. 



(1.) 



(2.) 



(3.) 



(40 



(5.) 



(6-) 



(7.) 



(8.) 



(9.) 







* Corrects 



d for Index Error + C 



■65. 









t Evident 



y a mistake ; the erro 



r amounting to nearly 1J°. 





The following comparisons with the same apparatus and a different barometer, 

 I find recorded as made at Edinburgh in January 1843. 



Barom. 



Boiling Point 



corrected. 



corrected. 



27-760 



208-57 



29-040 



210-72 



29-879 



211-95 



30-064 



212-18 



If we project the Alpine observations alone (which are the most consistent 

 with one another), in the manner exemplified in my former paper, as is done in 

 Plate III, fig. 1, I find that they may be admirably represented by a straight in- 

 terpolating line (giving the results recorded in column (5) of the preceding Table), 

 and yield the following results. 



The uncorrected reading of the thermometer, at the standard pressure of 

 30 inches, is 212°-75 ; at a pressure of 760 millimetres (29922 inches), 212°-62, 

 The Edinburgh observations (distinguished by the letter e), taken separately, 

 give almost the same results. 



The Alpine observations above give a uniform rate of ascent of 543-2 feet for 

 1° of fall in the boiling point. This is when we use Laplace's barometric coefn- 



