92 
supposition the photosphere radiates as an absolutely black body, so 
that PLANCK's formula may be applied, according to which’) : 
7.211><10° 
EN er EN 
2.1563 X 2890 
nee il en) 
The quantities J, from the table are expressed in an unknown unity. 
When we consider this unity and 7’ as unknown quantities, then 
T can be solved from two values of J, (for 4, and A, e.g.). 
Lf our basis is correct, we must find the same temperature from 
all combinations in pairs of L. | 
Drranr calculates 7’ from the combinations 
1=05 1700 } 
4,=0.9 I,= 180 | 7” = 8900 
and 
4,00. hh =300 T — 8700° 
7 ae i) 
and considers the agreement “geniigend’’. (loc. cit. p. 517). 
TABLE II. 
Wavelength A | 1 + 0.0405 24 b (0,0) i) | 5 
0223 nk A2 0.299 144 481.8 
0.386 2.824 0.479 338 105.7 
0.433 2.152 0.593 456 769.5 
0.456 1.937 0.644 515 799.8 
0.481 1.757 0.682 511 748.9 
0.501 1.646 0.710 489 688.7 
0.534 1.498 - 0.737 463 628.1 
0.604 1.304 0.816 399 500.2 
0.670 1.201 - 0.853 333 390.5 
0.699 1,170 0.864 307 355.2 
0.866 1.072 0.903 174 192.8 | 
1.031 1.036 0.918 111 120.9 
1.225 1.018 0.926 11.6 83.8 
1.655 1.005, 0.931 39.5 42.4 
2.097 1.002, 0.932 14.0 15.0 
1) The constants are those used by DeFANTr. 
