Errors of a Straight Scale. 



347 



Table A. 

 Horizontal argument : Scale readings. 





78 mm 



^^mm 



76 mm 



75 mm 



*l 4. ram 



•73mm 



Operation 1 



130027 (3) 



14-9983 (3) 











2 



11-0023 (3) 



13-0005 (1) 



14-9960 (3) 









3 



9-0070 (3) 



110088 (1) 



13-0075 (1) 



15-0038 (3) 







4 



7-0062 (3) 



9-0075 (1) 



11-0055 (1) 



130075 (1) 



15-0013 (3) 

 12-9950 (r 





" 5 



4-9945 (3; 



6 9935 (1) 



8-9940 (1) 10-9985 (1) 



14-9917 (3) 



6 





5-0045 (3) 



6-9995 (1) 9 0035 (1) 



11-0035(1) 



13-0022 (3) 



7 







4-9970 (3) 



6-9980 (1) 



9-0000 (1) 



10-9982 (3) 



8 









5-0013 (3) 



7-0015 (1) 



8-9992 (3) 



9 









5-0003 (3) 



7-0002 (3) 



Table B. 

 Excess of Two Revolutions of Screw over Space on Scale. 





Screw. 

 5-7 



Screw 

 7-9 



Screw 

 9-11 



Screw 

 11-13 



Screw 

 13-15 



Scale 78-77 

 11 17-76' 

 " 76-75 

 " 75-74 - 

 " 74-73 



-•0010 



-•0025 



+ •0010 



+ •0002 



-•0001 



+ •0013 

 + •0005 

 + •0050 

 + •0020 

 -•0023 



+ -0018 

 -•0020 

 + •0045 

 — •0005 

 -•0018 



-•0018 



— •0013 

 + •0020 

 -•0035 



— •0013 



-•0044 

 -•0045 

 -•0037 

 -0062 

 -0033 



Means 



-•0005 

 K, 



+ •0013 

 K 2 



+ •0004 

 K 3 



— •0012 



K 4 



-•0044 

 K 5 



Table C. 



Screw 



K 



2K 



-mK 



5 



•0000 



•0000 



•0000 



7 



— •0005 



-•0005 



+ •0008 



9 



+ •0013 



+ •0008 



+ •0017 



11 



+ •0004 



+ •0012 



+ •0025 



13 



-•0012 



•0000 



+ •0036 



15 



-•0044 



-•0044 



+ -0044 



Obs'r. S. 

 Div. error 



•0000 

 + -0003 

 + •0025 

 + •0037 

 + •0036 



•0000 



Obs'r. L. 

 Div. error 



•0000 

 + •0016 

 + •0018 

 + •0031 

 + •0036 



•0000 



Obs'r. S. 



2d set 



Div. error 



•0000 

 -•0002 

 + •0016 

 + •0027 

 + •0033 



•0000 



Mean 



•0000 

 + •0006 

 + •0020 

 + •0032 

 + •0035 



•0000 



These division errors are to be subtracted from observed 

 readings of the screw. 



Columbia University Observatory, New York. 



