582 
MR. R. w. sim:wart on the absolute thermal 
Hence the value of (sd) at f C. is given by 
7-56 (1 - -0000380 X -1095 (1 + -000730 = -828 (I + -0006920- 
Value of K, the Diffiisivity of Iron, in Absolute Units. 
From the results obtained above the value of k at f C. will be given by 
Ki= {klsd)i= -175 (1 — -00150 -t- *828 (1 + -0006920- 
That is, 
or, 
Ki— -211 (1 - -00150 (1 - -0006920, 
Kt= -211 {1 ~ -00219^ + -00000105^0- 
This result is probably represented with sufficient accuracy by 
/ct = -211 (1 — -00221). 
