28 
MR. H. TOMLINSON" ON THE INFLUENCE OF STRESS 
Table II. 
Name of metal. 
Condition. 
Specific 
gravity of water 
at 4° C. = l. 
A. 
Torsional rigidity 
in grms. per square 
centim. 
r. 
Young’s modulus 
in grms. per square 
centim. 
e. 
Ratio of lateral 
contraction to 
linear 
elongation. 
< 7 . 
Iron (1)* . 
Annealed . 
7759 
773-1 x 10 6 
1981 x 10 6 
•281 
Iron (2) . 
Hard drawn . 
7-740 
771-1 xlO 6 
2041 x 10 6 
•325 
Iron (3) . 
Hard drawn . 
7-520 
637-2 x 10 6 
1683 x 10 6 
•321 
Piano steel (1) . . . 
Hard drawn . 
7-814 
746-5 x 106 
1894 xlO 6 
•269 
Piano steel (2) 
Hard drawn . 
7-784 
782-3 x 10 6 
1968 x 10 6 
•259 
Platinum (1) . 
Hard drawn . 
21-323 
686-4 xlO 6 
1443 x 10 6 
•051 
Platinum (1) . 
Annealed . 
21-300 
692-7 xlO 6 
1490 x10 6 
•076 
German-silver (1) . 
Annealed . 
8-700 
493-7 x 10 6 
1335 xlO 6 
•354 
German-silver (2) . 
Annealed . 
8-632 
456-2 x 10 6 
1291 x lO 6 
•415 
German-silver (2) . 
Hard drawn . 
8-632 
389-6 x 10 6 
1169 x 10 6 
•500 
Copper (1) . . 
Annealed . 
8-913 
440-6 x 10 6 
1160 x10 6 
•315 
Copper (1) . . . . 
H ard drawn . 
8-896 
418-2 x 10 6 
1449 x 10 6 
•733 
Copper (2) .... 
Annealed . 
8-851 
419-3 x 10 6 
1218 x 10 6 
•453 
Copper (3) .... 
Annealed . 
8-825 
457-4x106 
1143 x 10 6 
•293 
Platinum-silver (l)f 
Annealed . 
12-623 
369-9 x 10 6 
1051 x 10 6 
•420 
Platinum-silver (1). 
Hard drawn . 
12-608 
302-3 x 10 6 
1038 x10 6 
•717 
Brass (1). 
Hard drawn . 
8-396 
321-1 xlO 6 
988-4 x 10 6 
■587 
Brass (2). 
Hard drawn . 
8-488 
332-5 x 10 6 
988-1 x 10 6 
•504 
Zinc (1) . 
Hard drawn . 
7-138 
338-4 xlO 6 
766-9 x 10 6 
•133 
Silver (1) . 
Annealed . 
10-491 
271-8x106 
742-4 x 10 6 
•367 
Silver (1) . 
Hard drawn . 
10-434 
274-6x106 
764-5 x 10 6 
•392 
Aluminium (1) . 
Hard drawn . 
2-730 
249-8 x 10 6 
669''4 xlO 6 
•340 
Aluminium (1) . 
Annealed . 
2-732 
265-2x106 
673-1 x 10 s 
•269 
Tin (1) . 
Drawn . . . 
7-264 
120-9 x 10 6 
277-lxlO 6 
•145 
Lead (1) . 
Drawn . 
11-193 
74-0 x 10 6 
167-0 xlO 6 
T36 
Remarks on Table IT. 
The determinations of r were made in all cases with unstretched pieces of the 
different wires, and may for the most part be considered as extremely accurate, but in 
the cases of tin and lead it was found very difficult to obtain good observations on 
account of the great viscosity of these metals; indeed, with the former only four 
vibrations of convenient amplitude could be counted. 
Tin, lead, zinc, and aluminium are placed in the order of their viscosity. 
The annealed and hard drawn wires having the same numbers attached to them in 
the tables are not the same pieces but are cut from the same liank. I should have 
employed actually the same pieces in the two conditions, had I not wanted them for the 
purposes mentioned in Part II. 
* This metal and copper (3) I obtained through the kindness of Sir W. Thomson ; their moduli of elas¬ 
ticity had been carefully determined by T. Gray, in the Physical Laboratory of Glasgow University. 
Ii’on (2), (3), steel (1), (2), and brass (2) were tested some years ago by myself with the cathetometer. 
t This alloy was composed of two parts by weight of silver and one of platinum. 
