( 423 ) 



(Icjil. We now iiitciid lo coiiiiiniiiicnlc soiiu^ iiieiisiii'oiiieiils rohiling' 

 1() 1^' and 2'"'. 



§ 2. Siirrci/ of t/u' (Ictciinbidtions. 



With regiii'd to the conti'ols meant snb 2"^ two iiKlei)endent determi- 

 nations ha\e been made with entirely the same apparatns for com- 

 parison. Tlie measnrements meant snb 1®' did not entirely succeed 

 owing to a small reparation which the resistance thermometer 

 required. ') These measurements, however, have tiiereby ac<iuired 

 a signitication in anollier res|»ect, namely as a new calibration 

 from — 104^ to - 259° of the i-esistance thermometer used in Comm. 

 N". 95'', they allow us to judge in how far after similar reparations, 

 wiiich in the long run will be inevitable, the same temperature 

 coeflicients will remaiji valid for the resistance thermometer. 



The communicated measurements determine also with a greater 

 accuracy a cou[)le of temperatures (comj). however note 2 in § 3, 2") 

 wiiich hitherto had not been determined with the desired reliability 

 (comp. §§ 3 and 5) "'). 



The results have been combined in a table foHowing below. The 

 second and tiiird cobimiis contain the rcatbngs of the hydrogen 

 thermometer and of tlie resistance thermometer. Those of tiie hydrogen 

 thermometer are calculated in the way of N". 95« (designated by and 

 therefore require the corrections mentioned in Comm. N". 97'' (March 

 1907). They have not l)een applied hei'e because this had not been 

 done in any of the preceding connnunications and mutual comparison 

 is thereby facilitated. The next column shows the resistances of 

 column 3 recalculated \\'\{\\ the factor 1.01806, which is the ratio 

 between the resistances at (P C. before and after the breaking of the 

 wire. These values have been compared with formula Ai of § '6 of 

 (^omm. N". 95''. The lifth column contains the deviations from this 

 formula. The sixth column contains the ditferences which were to 

 be expected according to Comm N". 95^'. The seventh colum contains 

 the diflerences between the tw^o resistance thermometers in ii. 



') When the resistance broke only ' Vio of die wire was lost, yet on account of 

 this one might allege that if tlie latter is not perfectly homogeneous variations in 

 the coefficients of temperature are not entirely excluded. These are especially to 

 he feared as a result of the new winding of the wire. 



~) These measurements are used in table V, Comm. N". 91)'' (Sept. 1907) at 

 -■252^82 and — 2ü5M8 deviating from table I, Comm. N". 95'- (Sept. 190Ü). 



