,.,;MK. IH .:ll F, CALLKNPAR AND MR. HERBERT MOSS 

 5 , /[.-Oluervation*, 187 0, to 300 C. (continued). 



* Apparatus allowed to cool between the two sets of observations. 



Confirmatory Series. 



As the determinations of the coefficient of expansion below 187 C. had all been 

 made with the old set of steel tubes, whereas the determinations at temperatures 

 above 187 C. had all been made after the apparatus had been taken down and 

 re-erected with the new set of steel tubes, a short series of observations were taken 

 to confirm the earlier results. Some observations were also taken at intermediate 

 temperatures, but no use was made of these in evaluting an equation, as time did not 

 permit of obtaining the steady state of temperature secured in runs of longer 

 duration. 



The following is a summary of the results, reduced to C. : 



Date. 



July 19, 1909 

 19, 1909 

 19, 1909 



July 20, 190'.i 

 20, 1909 



IV n-snlts w,.,v not worked out beyond the limits of accuracy of the readings, but 

 ; obtained with the equation calculated from the previous observations 



