ON THE MEASUREMENTS OF WAVE-LENGTHS. 
75 
Table of means and numbers adopted as correct measurements of the fiducial lines 
on each plate (continued). 
Spectra to the left. 
Portions 11-18 (continued). Measurements in hundredths of an inch. 
(5) 
Fiducial lines. 
Mean 
measurements. 
Adopted numbers. 
Intervals. 
XV. 
o-ooo 
o-ooo 
48-80 
XIV. 
48-757 
48-80 
49-80 
XIII. 
98-67 
98-60 
50-80 
XII. 
149-457 
149-40 
51-90 
XI. 
201-35 
201-30 
53-15 
X. 
254-443 
254-45 
54-50 
IX. 
308-907 
308-95 
(«) 
Fiducial lines. 
Mean 
measurements. 
Adopted numbers. 
Intervals. 
XV. 
o-ooo 
o-ooo 
48-775 
XIV. 
48-745 
48-775 
49-775 
xm. 
98-605 
98-55 
50-775 
XII. 
149-44 
149-325 
51-825 
XI. 
201-215 
201-20 
53-125 
X. 
254-305 
254-325 
54-475 
IX. 
308-765 
308-80 
