364. On the PROGRESS of HEAT 
b 
b+n 
or 4X 3K28x xX = to a given quantity, or to a *, and 
therefore pees x) * 2 ee _ as =: 
rs = 3a" ox Hence ) = 
WEE = a - Log x, Suppofe that when x= 7, the radius 
ef the heated nucleus, 4 =H; then H= 
2 
a 
c+ Sut Log 7, and C= 
FY a. Sage < Log 7; therefore 4 = 
ar 
a a ae £ 
In this expreffion a* will be determined, if the temperature at 
any other diftance R from the centre is known. Let this be 
T ; then by fubftitution we have 
a T—H 
and a= : : : - 
Ce en ee 
T—H 
bience 2 ae ee Oe BNR 
3 Sok °F R 
I z I r 
Care or 
15. Tris 
< heen 
ry i 
Oe 
