SAA AA AA KAA 
EXPLANATION OF PLATE I 
Rovem Puans or Position CIRCLE, ETC. 
Fig. I.—Field of Oblique Transit Eye-piece. 
MM Meridian transit wire. 
TT  Declination parallel wire. 
ww Declination parallel web. 
TW 20° oblique transit wire. 
Tw  i0?oblique transit web. 
Fig. II.—Position Circle. 
E Eye-hole. 
C Cap for fastening circle to tube of telescope. 
Fig. III.—Vertical Section. 
C Position circle. 
F Field lens. 
T  Eye-piece tube. 
T" Telescope tube. 
œ Clamp and screw for index. 
I 
Rouen SECTION oF CLEPSYDRA. 
Fi 
Bars, supports 
D Lever. 
F Fulcrum. 
S^ Sp 1 
ring. 
P  Pegto limit movement of lever. 
F^ Fastening of spring. 
S" Spring to keep valve shut. 
