Comparisons of Mercury and Platinum Titer momelers. 41 



each thermometer separately, and each mean was then re- 

 duced to the nitrogen-scale by the proper correction factor K. 

 The general mean value of J at that temperature was then 

 obtained by taking the mean of the values given by each 

 thermometer, giving to each thermometer a weight equal to 

 the number of experiments performed with that thermometer 

 at the given temperature. These values of J, corrected as 

 indicated above, were then plotted, and the values obtained 

 from the resulting smooth curve were taken as the final value 

 of J on the nitrogen-scale. For the sake of comparison, the 

 original as well as the corrected values of J are given in the 

 following table. 



Table XV. 



Temp. 



Rowland's 



values of J 



(absolute scale) 



on the C.G.S. 



System. 



Rowland's 



values of J 



reduced to Paris 



Nitrogen-Scale 



on the C.G.S. 



System. 



Temp. 



Rowland's 



values of J 



(absolute scale) 



on the C.G.S. 



System. 



Rowland's 



values of J 



reduced to Paris 



Nitrogen-Scale 



on the C.G.S. 



System. 



7° 



4-207 Xl0 7 



4 200X10 7 



22° 



4-176 Xl0 7 



4-17SX10 7 



8° 



4 204 



4-198 



23° 



4175 



4-177 



9° 



4-202 



4-196 



24° 



4174 



4-177 



10° 



4-200 



4-195 



25° 



4173 



4-176 



11° 



4-198 



4-193 



26° 



4172 



4-175 



12° 



4-190 



4-192 



27° 



4171 



4-175 



13° 



4-194 



4190 



28° 



4171 



4174 



14° 



4-192 



4-189 



29° 



4-170 



4174 



15° 



4-189 



4187 



30° 



4-171 



4175 



16° 



4-187 



4-186 



i 3i° 



4-171 



4175 



17° 



4-185 



4-184 



32° 



4-171 



4-175 



18° 



4-183 



4183 



: 33° 



4-172 



4-175 



19° 



4-181 



4-182 



S 34° 



4-172 



4-176 



20° 



4-179 



4-181 



35° 



4-173 



4-177 



21° 



4-177 



4-179 



! 36° 



4173 



4-178 



These results are also plotted in fig. 6 (p. 42). For the sake 

 of comparison the electrical determinations of the mechanical 

 equivalent by Griffiths and by Schuster and Gannon are also 

 shown on the same figure. 



Conclusions. 



These comparisons would seem to show that Baudin 616;), 

 when its indications are reduced to the absolute scale by 

 means of Rowland's tables, reads lower than the Paris 

 nitrogen-scale over the range 0° to 35°, these differences 

 amounting to a 016 at 10°, 0°'014 at 20°, and 0°-009 at 30°. 



