348 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



Fig. 785. 



A, horizontal plates ; B, compass-box ; C, Vertical axis ; D, D, 

 verniers ; E, ball and Socket ; F, upper parallel plate ; G, lower par- 

 allel plate ; H, staff-head ; I, mahogany tripod legs ; K, supports for 

 axis of telescope ; M, telescope ; N, cross-hair with screw adjustment ; 

 O, screw adjustments for eye-piece ; P, milled-head turning pinion for 

 adjusting focus of object-glass ; Q, tangent-screw for vertical motion of 

 telescope. K, tangent-screw for horizontal motion of telescope ; S, 

 tangent-screw for moving vertical axis ; T, T, spirit-levels ; U, milled- 

 head screw for compass-stop. 



