Prof. W. Thomson on the Elasticity and Viscosity of Metals. 69 

 Table (continued). 











Time of 







Length of 

 wire, in 

 centime- 

 tres, 



Volume, in 

 cubic cen- 

 timetres, 



Density. 



Moment 

 inertia of 

 vibrator, 



vibration 

 one way 

 (or half- 

 period), 



in seconds, 



Rigidity, in 



grammes weight 



per square 



centimetre, 



Substances. 



/. 



V. 





W&2. 



2ir3/3\Vft 2 













T. 



g- T 2 V 2 





261-9 



1-703 



8-398 





5-96 



350-1 XlO 6 



Brass. 



24350 



15-30 



8-91 



38186 



16-375 



448-7 XlO 6 



Copper. 



„ 



»j 



,, 



61412 



20-77 



448-4 XlO 6 





214-4 



1-348 



8-864 



31771 



5-015 



4330 XlO 6 



Copper c . 



,, 



,, 



>» 



61412 



6-982 



431-8 XlO 6 





143-7 



•9096 



8-674 





3-381 



393-4 XlO 6 



Copper d . 



286-8 







20612 



4-245 



4429 XlO 6 



Copper e . 



291 









4-375 



435-6 XlO 6 





293 









4-417 



436-2 X1G 6 





296-1 









4-500 



433-8 XlO 6 





300-0 









4-588 



434-0 XlO 6 





303-4 









4-646 



437-8 XlO 6 



n 



309-3 









4-833 



428-6 XlO 6 





313-2 









4-931 



427-5 XlO 6 





317-4 



1-962 



8-835 





5040 



425-9 XlO 6 





2156 







31771 



8-155 



442-3 XlO 6 



Copper f . 



235-5 









9-425 



432-2 XlO 6 





251-9 



•827 



8-872 





10-463 



428-6 XlO 6 





253-2 



1-580 



8-91 





5-285 



472-9 XlO 6 



Copper e . 



262-8 









5-640 



464-3 XlO 6 





270-4 









5-910 



460-4 XlO 6 





278-7 









6-20 



458-5 XlO 6 





287-9 









6-5325 



455-0 XlO 6 





297-5 









6-8195 



451-0 XlO 6 





308-8 









7-3075 



448-9 XlO 6 





256-5 



1-6145 



8-90 





4-226 



463-5 XlO 6 



Copper h . 



267-9 









45625 



453-3 XlO 6 





280-1 









4-915 



446-2 XlO 6 





292-2 













5-240 



445-5 XlO 6 





301-9 









5-532 



438-2 XlO 6 





316-8 









6-655 



791-4 XlC 6 



Soft iron '. 



322-1 









6-88 



778-3 XlO 6 





335-1 









7-301 



779-0 XlO 6 





347-4 









7-768 



766-6X10 6 





366-0 



1-357 



7-657 





8-455 



756-0 XlO 6 



>» 



39-4 



•1745 



20-805 



20612 



2-05 



622-25 XlO 6 



Platinum k . 



65-9 



•1825 



19-8 



10902 





281 X 10 6 



Gold 1 . 



75-7 



•1185 



10-21 



10967 





270 XlO 6 



Silver \ 



Remarks. 

 c A piece of the preceding stretched. 

 d The preceding made red-hot in a crucible filled with powdered charcoal and 



allowed to cool slowly, became very brittle : a part of it with difficulty saved 



for the experiment. 

 e Another piece of the long (2435 centims.) wire; stretched by successive 



simple tractions. 

 f A finer-gauge copper wire; stretched by successive tractions. 

 B Old copper wire, softened by being heated to redness and plunged in water. 



A lengthof260centims. cut from this, suspended, and elongated by successive 



tractions. 

 h Another length of 260 centims. cut from the same and similarly treated. 

 1 One piece, successively elongated by simple tractions till it broke. 

 k Not stretched yet for a second experiment. 

 1 Added, May 27, after the reading of the paper. 



