SMITHSONIAN jMISCELLANEOUS COLLECTIONS VOL. 82 



Table i. — Corrections to Wave-Lengths of Annals, Volume I 

 {Corrections are stated in Angstroms, ivave-lcngths in microns.) 



Wave-lengths. 

 Corrections . . . 



1 . 14 to end 

 



In further determination of wave-lengths, Mr. Freeman identified 

 81 deflections as corresponding each to each in the old and the new 

 bolometric work. These deflections covered fairly uniformly the range 

 from 0.76/u. to i.8o/A. Having taken out from the tables of Volume I 

 of the Annals the corresponding wave-lengths, he then applied to these 

 values the corrections fixed by table i. He then plotted on a sufficiently 

 large scale the observed linear places of these 8i deflections as ordi- 

 nates, and the corrected wave-lengths as abscissae. The curves thus 

 defined could easily be read off to a single Angstrom. From them 

 were read all the wave-lengths given in table 3, which contains over 

 1200 lines. 



Table 2. — Circumstances of Observation 



Date 



1928 Curve 



Sept. 4 I 



2 



3 

 Sept. 4 I 



2 



3 

 Sept. 5 I 



2 



3 



Sept. I I 



2 



3 



Sept. 1 3 



2 

 I 



Air-mass 



Start 



9:39 

 10: 17 

 10: 52 

 6:28 

 7:59 

 8:51 

 6:34 

 9: II 

 9:50 



6: 29 

 9: 19 

 9:58 

 3:34 

 2:58 

 i: 13 



Finish 

 10: 09 

 10:47 



II : 22 



6:58 

 8:29 



9: 21 

 7:04 

 9:41 



10: 20 

 6:59 

 9:49 



10:28 



3:54 

 3:28 



1:43 



Start 



I-3I 

 1. 21 



I-I5 

 4.85 

 1.97 

 1-54 

 4-49 

 1-43 

 1.28 

 4.70 

 1.36 

 1.24 

 1.82 



1-54 

 1. 17 



Finish 



1-23 

 I. 16 

 I. 12 



1.69 

 1.38 



3-05 

 I-3I 

 1.20 



3-15 

 1.27 

 1. 17 

 2.18 

 1.76 

 1.23 



Notes 



.Slight earthquake 



Ends off plate 



