ON SOLAE PHYSICS. 
9 
bring the centre of the intersecting wires of the microscope to cover the point to be 
determined, so as to avoid any error arising from the thickness of the wires. 
The following form, which gives the complete measurements and data for calculation 
of two pictures taken on the same day, hardly requires, after the preceding remarks, any 
further elucidation. 
Vernier position 0° 0-093 
3-930 
C=2-012 
1862, August 25. 
l 0 h 37m 
Vernier position 90° 0-094 
D=3-837 ’ 3-934 
R=l-918 5 C=2-014 
C=2-013 
R=T919 
D=3-840 
R=l-920 
I. 0-099 38 33-5 II. 0-094 
III. 0-094 228 23-7 IV. 0-095 
266 57-2 
133 28-6, .-. 43° 28' -6 
<3= — 10'-7 
132 17-3 
315 1-3 
447 18-6 
223 39-3, .*. 133° 39'-3 
A+/=+45 35-5 
y=- 5-3 
^-90°) I. to III. =—43 28-6 
+ 2 1-6 
ll h 14 m . 
Vernier position 0° 0*095 
Vernier position 90 c 
3-930 
D=3-835 
0-095 
3-929 D=3-834 
C=2-013 R=l-917 
C=2-012 R=l-917 
C=2-012 
R=l-917 
I. 0-095 41 51-2 II. 0-102 
III. 0-095 224 53-3 IV. 0-097 
266 44-5 
133 22-2, .-. 43° 22'-2 
0 = — 8'-8 
132° 47-2 
314 14-7 
447 1-9 
223 31-0, 
133° 31' 0 
MDCCCLXIX. 
c 
