76 
PROFESSOR W. N. HARTLEY AND MR. W. E. ADENEY 
Table of means and numbers adopted as correct measurements of the fiducial line 
on each plate (continued). 
Spectra to the left. 
Portions 11-18 (continued). Measurements in hundredths of an inch. 
( 7 ) 
Fiducial lines. 
Mean 
measurements. 
Adopted numbers. 
Intervals. 
XY. 
o-ooo 
o-ooo 
49-05 
XIY. 
49-09 
49-05 
50-05 
XIII. 
99-108 
9910 
51-05 • 
XII. 
150-218 
150-15 
52-15 
XI. 
202-410 
202-30 
53-40 
X. 
255-695 
255-70 
54-75 
IX. 
310-305 
310-40 
(3) (9) 
Fiducial lines. 
Aluminium 
readings. 
Adopted 
numbers. 
Intervals. 
Copper 
readings. 
Adopted 
numbers. 
Intervals. 
XY. 
o-ooo 
o-ooo 
48-70 
0-000 
o-ooo 
48-625 
XIY. 
48-705 
48-70 
49-70 
48-64 
48-625 
49-625 
XIII. 
98-31 
98-40 
50-70 
98-18 
98-25 
50"625 
XII. 
149-065 
149-01 
51-80 
148-78 
148-875 
51-725 
XI. 
200-97 
200-90 
53-05 
200-64 
200-60 
52-975 
X. 
254-01 
253-95 
54-40 
253-53 
253-575 
54-325 
IX. 
308-34 
308-35 
308-04 
307-90 
