188 



0. Barus — Viscosity of Solids. 



i=zv* 



Table 1 — continued. 

 p = 0'0405 cm . a = 28-5 cm . /3=31'5 C 



12 



+ •1007 



22 



. 2 



25° 





22 



5 

 11 

 29 





+ •0041 





36 





-•0993 



22 



2 







22 



13 

 20 





-•0053 





25 



o-oo 



330 



6-14 



10-07 



11-07 



- o-oo 



- 7-41 



- 9-16 

 -10-26 



1007 20 



20 



0041 



1001 20 

 20 



•0047 



-•1019 



— •0029 



- o-oo 



- 3-52 



- 5-26 



- 6-87 



0-00 

 290 

 5-66 

 7-92 

 8-61 

 9-62 



4 ! 



9l 

 17 

 23 

 86 

 45 

 59 



o-oo 



1-09 

 226 



2-90 

 3-98 

 4-53 

 5-43 



14 



-•1003 



20 



2 



25° 





20 



10 

 21 

 31 





-•0044 





' 42 





+ •0989 



20 



2 







20 



7 

 14 

 18 





+ •0057 





23 





-•1021 



20 



5 







20 



15 

 37 



57 

 63 





- -0026 





82 





+ •1019 





I 





+ •0029 





111 



17 

 100 : 



+ •1041 

 + •0006 



•1033 



-•00141 



22 



2 



22. 



12 





22 





34 



22 



1 



22 



15 





•is 



+ •1038 22 

 22 



•0009 



40 



— o-oo 



— 5-78 



— 8-63 



— 10-19 

 -11-48 



0-00 

 4-19 

 6-89 

 7-96 

 8-95 



0-00 

 1-99 

 4-11 

 5-18 

 5-60 

 6-38 



o-oo 



11-22 



0-00 

 1-50 

 2-21 



2-74 



- o-oo 



— 2-41 



— 3-21 



- 3-75 



o-oo 



1-15 

 1-91 



226 



The following table 2 is interpolated from the preceding, 

 and contains mean values of (9? — y/)/r, as derived from the two 

 twists, r, alternately positive and negative. The justification 

 of this mode of obtaining data for a chart is given in § 9. 

 Besides these data table 2 contains the number and temper 

 ("An."), and the electrical constant* (specific resistance, s , 

 microhms, cc, 0° (7.), as well as the differences s —s ' and 

 s lfm —sj, in which the subscripts are the temperatures at which 

 6- is taken, and s' is the constant of the normal rod, No. 1. 

 Hence these electrical differences correspond to (<p — y>')/T, 

 when 6=0° C. and when = 100° (7., respectively. For JSTo. 1, 

 6-/ = 18-6, s -s '=0- and (<p-(p , )/T=0. The values (<p—<p')/r 

 are in the same horizontal row with the temperatures, #, to 

 which they belong. It is not necessary to distinguish s — s' 

 and s M -s' M here. 



* For definition of thermo-electric hardness, cf. Bull. No. 14, p. 65. 



