ON THE MEASUREMENTS OF WAVE-LENGTHS. 
77 
Table of means and numbers ad<ypted as correct measurements of the fiducial lines 
on each plate (continued). 
Spectra to the left. 
Portions 17-26. Measurements in hundredths of an inch. 
( 10 ) ( 11 ) 
Fiducial lines. 
Mean 
measurements. 
Adopted 
numbers. 
Intervals. 
Tin 
measurements. 
Adopted 
numbers. 
Intervals. 
XII. 
o-ooo 
0-000 
85-80 
o-ooo 
o-ooo 
85-75 
XIII. 
85-80 
85-80 
82-20 
85-725 
85-75 
82-15 
XIV. 
168-01 
168-00 
78-70 
168-08 
167-90 
78-65 
XV. 
246-67 
246-70 
75-30 
246-435 
246-55 
75-25 
XVI. 
322-00 
322-00 
*v7 
to 
o 
o 
321-80 
321-80 
71-95 
XVII. 
394-36 
394-00 
393-91 
393-75 
(12) 
(13) 
Fiducial lines. 
Thallium 
measurements. 
Adopted 
numbers. 
Intervals. 
Indium 
measurements. 
Adopted 
numbers. 
Intervals. 
XII. 
o-ooo 
o-ooo 
85-70 
o-ooo 
o-ooo 
85-625 
XIII. 
85-685 
85-70 
82-10 
85-625 
85-625 
82-025 
XIV. 
167-81 
167-80 
• 78-60 
167-715 
167-65 
78-525 
XV. 
246-40 
246-40 
75-20 
246-055 
246-175 
75-125 
XVI. 
321-615 
321-60 
71-90 
321-31 
321-30 
71-825 
XVII. 
393-88 
393-50 
393-14 
393-125 
