PROF. HUGH L. CALLENDAK AND MR HERBERT MOSS 



11. (uri-i'i-tad Value of the Boiling-Point of Sulphur. 



The preliminary results published in the " Note on the Boiling-Point of Sulphur " 

 in September, 1909, were affected by a small error in the fundamental interval, which 

 at that time was uncertain, as the observations of Series III. had not then been 

 taken. As pointed out in the note in question, a small error of this type is practically 

 without effect on the result, owing to the manner in which the fundamental coefficient 

 enters int-> (lit- formula for the correction of the gas thermometer. The final value of 

 the lx>iling-j)oint of sulphur given in the note is not changed by more than 0'01 C. by 

 tlic error in the fundamental interval itself. Unfortunately the corresponding error 

 in the coefficient b, though much smaller, produces a larger error in the result, 

 namely, 0'06 C., but this is still within the limits of error of the gas thermometer. 



The following are the corrected values : 



The final corrected values of the ratios of the densities of mercury at C., 100 C., 

 and 184 C., given by formula (8), are as follows : 



D /D 100 = 1-0182054, D /D 184 1-0338016. 



The observations taken with the weight thermometer in March, 1900, as reduced 

 by EUMORFOPOULOS, assuming BROCK'S reduction of REGNAULT'S observations, gave 

 the following values of the coefficients expressing the expansion of the bulb : 



= 2387xlO- 8 , 6 = 0-42 x lO' 8 . 



Our final corrected values of the expansion of mercury give the following : _ 

 = 2377x10-", b .-= T37 x 10~ 8 . 



The correction to be added to the results of EUMORFOPOULOS for the boiling-point 

 of sulphur, calculated by the formula given in the previous note, is 



dt= +1-03 C. 



in place of dt == + 0'97 C., as previously found by the preliminary reduction. 



tly speaking, thjs correction applies only to the gas-thermometer observations 



th the same bulb as that used for the weight-thermometer determinations. 



the bo,ling-point of sulphur found with this particular bulb in March, 



The addition of the above correction would raise this result 



The final mean obtained by EUMORKOFOULOS from observations with 



be, of winch the expansion was not directly determined, was t = 443'58 C 



<>uld ra.se the corrected value of the boiling-point to t = 444-61 C. But since 



were not treated in exactly the same manner as the first bulb, it is 



I". Creator we.ght should be attached to the first result. The uncertainty 



nnometar determinations at this point is of the order of 0'l C and 



