Stress and Strain on the Properties of Matter. 499 



Table III. 



Metal. 



Density at 

 20° C. 



Density of 

 water at 

 4° C. = l. 



Thermal 

 capacity 

 per unit 

 volume 

 at 23° C. 

 Thermal 

 capacity of 

 water at 

 0° C. = 1. 



C . 



V 



a 



where a is 

 propor- 

 tional to 



the mean 

 distance 

 between 



the centres 



of conse- 

 cutive 



molecules. 



" Young's 

 modulus " 

 in grams 

 per sc[. cm. 



e. 



e 



= e x a". 



Iron (1) 



7 "759 



•8443 



•9452 



1981 x 10 6 



ZvQl. X 1U 



Conner (2) 



8 '851 



•8087 



• 9315 



1218 





Gr p rman- silver 













(2) 



8-632 



•8010 



•9289 



1230 



2060 



Platinum (1).. 



21 -309 



•6869 



•8824 



1467 



3521 



Zinc (1) 



7-138 



•6537 



•8680 



766-9 



2067 



Platinum-sil- 













yer (1) 



12 616 



•6031 



•8449 



1044 



3397 



Silver (1) .... 



10 -464 



•581L 



•8344 



753 -4 



2674 



Aluminium (1) 



2 731 



•5780 



•8329 



671 2 



2414 



Tin (1) 



7-264 



•3904 



•7308 



277-1 



2489 



Lead (1) 



11 -193 



•3424 



•6995 



167 -0 



2038 











Mean 



2561 x 10 6 



" Young's Modulus," whilst it will be seen from the last column of 

 the table that the products of e and — 7 all lie between 20 x 10 8 and 



30 X 10 8 , except as before in the case of platinum and platinum- silver. 

 It seemed advisable therefore to ascertain how far the constancy holds 

 good in the case of such other metals as have been examined by other 

 observers, for the purpose of determining the values of "Young's 

 Modulus " and the thermal capacities per unit volume. Table III is 

 accordingly supplemented by Table IV. 



VOL. XXXVIII. 



