158 



Mr. C. Barus on the Viscous Effect of 



2^' refer to the hard and the soft wires respectively, and 

 denote angular viscous motion of one right section relatively 

 to another, when their distance apart is 1 centim. of length 

 of wire. (^ — ^')/t need not be independent of t. (§ 8.) 



Table I. indicates that the wires were twisted 8 times 

 alternately in opposite directions. Before and after each 

 series of viscous measurements in Table I., the resistance of 

 the glass-hard wire was measured by a special device utilizing 

 Matthiessen and Hoskin's method. These results are given 

 in Table II., where rt is the observed resistance in microhms, 

 A?'i the variation from the final value, 7'^= 39500. 



Table I. — Viscous Effect of Motional Annealing. Grlass- 

 hard Steel. ^ = 29. L = 30 centim. + 30 centim. Dia- 

 meter of wires, 2p="081 centim. 



Twist 

 No. 



2(0+0'). 



Time. 



^-"^'xlO^ 



r 



Twist 

 No. 



2(0+0'). 



Time. 



^-^'xi03. 



r 







h m 









h 'm 





1. 



+ •0992 



2 25 





5. 



+ •1021 



3;40 









30 



+•00 







42 



+ •OO 







32 



•94 







44 



■68 







35 



1-99 







47 



1-38 







38 



2^79 





+•0026 



52 



2^19 





+•0055 



46 



4-45 











2. 



-•0983 



2 49 





6. 



-•1018 



3 65 









51 



- •oo 







57 



- •OO 







53 



-1-95 





1 



59 



- ^74 







56 



-3^97 







62 



-1^44 





-•0064 



63 



-5-93 





-•0029 



67 



-239 



3. 



+ •1021 



3 07 





7. 



+•1018 



4 09 









09 



+ •OO 







11 



■00 







11 



roi 







13 



■64 







14 



r99 







16 



1-2% 





+•0026 



21 



3-36 



8. 



+•0029 



20 



r89 



4. 



-■1021 



3 24 





-•1018 



4 23 









27 



- •OO 







25 



- -00 







29 



- -91 







27 



- ^64 







32 



-1-85 







30 



-1^28 





-•0026 



37 



-3^06 





-0029 



37 



-2^32 



