Coefficient of Normal Viscosity of Metals. 121 



The results of experiments for three copper bands are as 

 follows : — 



Table II. As rolled. 



Band. 



Weight. 



V 



T. 



£(15°C.). 



Curve No. 



1 



1 



0-0045 



0-586 



4-86 Xl0 8 ' 



1 



2 



1 



00195 



0-751 



4-89 „ 



2 



1 



3 



0-00125 



0-838 



5-11 „ 



3 



2 



2 



0-00088 



0-861 



4-63 „ 



4 



3 



1 



0-0003 



0-903 



4-68 „ 



5 



Mean: 4-83 XlO 8 



Table III. Annealed at 300° C. 



Band. 



Weight. 



K 



T. 



I (15° C). 



Curve No. 



1 



1 



1 

 2 



00051 

 0-0024 



0-610 

 0-740 



5-16x10* 



5-16 ., 



• 



6 



7 



Mean: 5-13 xlO 3 



From the above table, we see that the values of the 

 coefficient of normal viscosity deduced from different bands 

 agree satisfactorily with each other, showing the correctness 

 of the formula before deduced, and also that the normal 

 viscosity of copper increases by annealing. In the following- 

 tables, the results of experiment for a number of metals are 

 given : — 



Table IV. (20° C). 



Metal. 



a cm. 



Al (Rolled) No. 1 



No. 2 



„ (Annealed at 400° C.)... 

 Zn (Rolled) 



„ (Annealed at 200° C.)... : 



Ag (Hammered) 



„ (Annealed at 400° C.)... 



Mg (Hammered) 



„ (Anuealedat 400° C.)... 



! Ni (Rolled) 



j Brass (Rolled), Cu 58-9 %. 

 Zn39-4 % 



0-0997 

 0-0999 

 0-0999 

 0-0669 



0104 



0-120 



0105 

 ] 0-155 



b cm. 



X X10 3 . 



0-372 



0-45 



0-719 



0-65 



0719 



1-13 



0-356 



5-01 

 1-70 



0-500 



210 

 1-62 



0-500 



1-82 

 0-82 



0-497 



1-69 



0-354 



1 92 



Tsec. SxlO- 



0-798 I 



0-709 



0-716 



0878 ! 

 0-883 



0-731 

 0-719 



0-751 

 755 



o;^o 

 0-585 



0-822 

 0-723 

 0773 

 1-25 



27-4 

 9-27 



2-24 



1-6J 



0-7 22 



305 

 L-55 



/ = 26-0 cm., M=199-4 Rr 



