SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 71 



where c, d,- and d^ are the same 'as used before, -^should be prac- 

 tically constant and an average of all the values of this quantity is 

 used. 



In order to show the good agreement of values of A.' obtained by 

 this method a set of observations will be included. 



Hump Mountain, August 26, 1919 



Hour angle Zero 



Read- 

 ing 



Deflec- 

 tion 



Cur- 

 rent 



Correc 



tion 

 factor 



•97 

 ■97 

 •97 

 .96 



• 94 

 .96 



• 94 



• 95 



• 93 



• 95 



• 95 



• 94 

 .92 



• 93 

 .91 

 .92 

 •91 

 •92 

 .91 

 .90 



.91 



• 91 



• 91 



• 91 

 .92 



• 91 

 .92 

 .91 



• 93 



16.05 



15^42 



16. IS 



16.13 



16.21 



16.13 



16.39? 



16.18 



16.39 



16.95 



16.51 



16.42 



16.55 



16.87 



16.63 



16.79 



16.70 



16.50 



16.72 



16.72 



17.00 



16.40 



17.06 



20.00 



17. II 



19.30 



17.24 



17.08 



17-34 

 17.61 

 17-50 

 17-51 

 17-40 

 17-38 



9944 

 9945 

 9945 

 9945 



9945 



9946 

 9946 

 9946 



9945 

 9948 



9946 

 9947 



9947 

 9946 



Mean -7- = - 03508 

 dc 



do 



Air 

 mass 



Pyrhe- 

 liom- 



eter cal- 

 ories 



03510 



03518 



03518 



03513. 



03534 



03531 



03480 



03478 



03586? 



03480 



03514 



03367? 



03516 



03494 



03500 



03504 



03506 



1. 413 



1.462 



2.093 



2.090 

 2.072 



2.054? 



2.083 



2.087 



2.092 



2.099 



2.100 

 2.097 

 2.076 

 2.069 

 2! 086 

 2.074 

 2.071 

 2.064 

 2.083 



Mean=r 



2.083 



Tn obtaining the means the values at — 2 : 46 : 15, — 2 : 35 : 15 and — 2 : 29 : 15 

 were omitted, as the readings were questionable. 



Calibrations were made every few weeks, and up to December 20. 

 1 91 7, the value oi K was always found to be about 2.08. The instru- 



