THERMAL BMISSIVITY OP THIN WIRES IN AIR. 
405 
Solving equation (13) for various values of t, we find 
Temperature, 
in degrees Centigrade. 
Distance, in centimetres, 
from the end of the wire. 
15 
0 
100 
0-123 
200 
0-339 
270 
0-649 
320 
0-980 
312 
1-498 
314 
3-296 
If now a distribution of temperature curve be drawn, similar to that seen in fig. 15, 
but using these values of t and x instead of those found from equation (9), it is found 
that the two curves showing the distribution of temperature along the wire are not 
very different. We may therefore conclude that the exact shape of the curve for 
dH/dx 2 for small values of t, has but little effect on the resultant distribution of 
temperature curve, and therefore that no important error is made by assuming, as we 
have done, that the true curve for dH/dx 3 is a parabola, with its vertex on the line 
along which dH/dx 2 is reckoned in fig. 15. 
