Viscosity encountered on passing from Fluid to Solid. 347 



redness and cooling in air. Table VI. contains data for a 

 new glass-hard steel wire, originally free from stored twist. 

 Table VII., finally, contains the viscous behaviour of a wire 

 tempered at 450°, which was used as a normal in my former 

 differential experiments. 



Table IV. — Absolute Viscosity of a Glass-hard Steel Wire. 

 No. 1. Fourth Twist. 



Z=12-9 centim ; p = *0405 centim. ; P = 82x981 dynes; 

 X=9*43 centim. 



r. 

 2$. 



Time. 



NxlO 2 . 



20 X 10 6 . 



Time. 



2C*Xl0 9 . 



^xlO -15 ' 













Radians 





Radians. 



Sec. 



Centim. 



Radians per 

 centim. 



Sec. 



per centim. 

 per sec. 



g/cs. 



•12 







Twisted. 















420 







*0 



500 



735 



122 





720 



104 



202 



1000 



462 



194 





1020 



180 



349 



1500 



310 



291 





1860 



320 



621 



2000 



222 



405 





2220 



360 



698 



2500 



183 



491 





2820 



417 



808 



3000 



150 



600 





3480 



465 



901 











No. 1. Glass-hard. 



Fifth Twist. 





-•12 







Twisted. 













•009 



480 



*0 



*0 



500 



*910 



99 





840 



120 



233 



1000 



474 



190 





1320 



235 



450 



1500 



347 



259 





1860 



329 



638 



2000 



270 



333 





2400 



402 



779 



2500 



230 



391 





2940 



464 



900 



3000 



210 



428 





3480 



520 



1008 











No. 1. Glass-hard. 



Sixth Twist. 





•12 







Twisted. 













-•009 



360 











500 



467 



193 





960 



120 



233 



1000 



265 



339 





1260 



160 



310 



1500 



193 



466 





X800 



210 



407 



2000 



156 



577 





2340 



250 



485 



2500 



138 



652 





3120 



306 



593 



3000 



126 



715 





3900 



353 



684 









* The minus signs, being without interest in this and the following similar 

 series, are omitted for brevity. 



