816 
MR. H. TOMLINSON ON THE INFLUENCE OF STRESS AND 
Experiment IV. 
Annealed Copper Wire *1622 centim. in diameter and 602 centims. in length. 
Bar B 3 and Cylinders C 3 . 
Vibration-period 
in seconds. 
Observed logarithmic 
decrement for one 
vibration. 
Logarithmic decrement 
due to the 
resistance of the air. 
Logarithmic decrement 
dne to internal 
molecular friction. 
Temperature in 
degrees Centigrade. 
1-7180 
•0006597 
•0003833 
•0002764 
17T3 
2-2984 
•0005971 
•0003644 
•0002327 
15-20 
3-1190 
•0006136 
•0003481 
•0002655 
15T7 
4-7230 
•0006552 
•0003776 
•0002776 
14-60 
6-3010 
•0006835 
■0004222 
•0002613 
17-90 
7-9335 
•0007347 
•0004752 
•0002595 
16-20 
Mean 
•0002622 
16-03 
Experiment V. 
Unannealed Zinc Wire ’07913 centim. in diameter and 602 centims. in length. 
Bar B x and Cylinders C x used. 
Vibration-period 
in seconds. 
Observed 
logarithmic 
decrement for one 
vibration. 
Logarithmic 
decrement due to 
the resistance of the 
air. 
Logarithmic 
decrement due to 
internal molecular 
friction. 
Temperature in 
degrees Centigrade.* 
5-875 
•02116 
•00113 
•02003 
19-86 
7-222 
•02243 
•00106 
•02137 
19-86 
15-313 
•02632 
•00094 
•02538 
19-86 
Experiment VI. 
A wire of tin, unannealed, 607'3 centims. in length and '09944 centim. in diameter. 
The vibrator consisted of a solid cylindrical bar 23'3 centims. in length, 0'320 centim. 
in diameter, and 16'282 grms. in mass; suspended from the bar were two brass 
cylinders, each 1T27 centim, in diameter, 1*85 centim. in height, and 16'006 grms. in 
mass. The total mass of the vibrator was 49 grms. 
* The temperatures varied from 18°'34 C. to 21 '87 C., but data were at hand for correcting the value 
of the logarithmic decrement when the temperature differed from the average, 19°'86 C. A similar 
remark applies to the temperatures 10°'25 C. and 3°'40 C. of the next experiment. 
