MR. R. T. GLAZEBROOK ON PLANE WAVES IN A BIAXAL CRYSTAL. 
299 
Work for reducing one Observation. 
Direct reading 
O 
Reflexion reading 
Deviation reading 
i =angle of prism 
263° 39' 
180° 5' 
297° 34' 12" 
42° 52' 30" 
(f>=^fl80 — (Direct — Reflexion)} 
=1(180° 5' — 83° 39') 
= 48° 13'. Error — 5". 
D+i = D-220° 48' 30" 
= 76° 45' 42". Error+10". 
xfj=J)-\-i—(f)=28 0 32' 42". Error+15' 
0 + D + i 
2 2 
;38° 22' 51". Error+ 5'. 
50' 9". Error-10". 
L tan ~ = 9’5936354. 
Loot 0 ** 
10-1012497 
Error. 
216 
Ltan^ 
2 
9-2389842 
Error. 
-1252 
L tan D 
2 
8-9338693 
Error. 
-1036 
0' — -f' 
2 
4° 54' 30'' 
-4" 
0' 
26° 19' 45” 
-4” 
0' 
16° 30' 45” 
+ 4” 
L sin 0 
9-8725466 
-94 
L sin 0' • 
9-6469205 
-170 
log p 
•2256261 
-76 
L sin -0 
9-6792905 
580 
L sin "0' 
9-4536616 
284 
log 
•2256289 
396 
fi from 0 
1-68123 
-3 
fa from \Jr 
' 1-68124 
+ 15 
mean 
1-681235 
2 Q 2 
