﻿EXPLANATION 
  OF 
  PLATE 
  I. 
  

  

  Bough 
  Plans 
  of 
  Position 
  Circle, 
  eic. 
  

  

  Fig. 
  I. 
  — 
  Field 
  of 
  Oblique 
  Transit 
  Eye-piece. 
  

   M 
  M 
  Meridian 
  transit 
  wire. 
  

   T 
  T 
  Declination 
  parallel 
  wire, 
  

   w 
  w 
  Declination 
  parallel 
  web. 
  

   T 
  W 
  20° 
  oblique 
  transit 
  wire. 
  

   T 
  w 
  10° 
  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. 
  

  

  E 
  

  

  Eye 
  lens. 
  

  

  "W 
  ' 
  

  

  5V 
  Wires. 
  

  

  F 
  

  

  Field 
  lens. 
  

  

  T 
  

  

  Eye-piece 
  tube. 
  

  

  T' 
  

  

  Telescope 
  tube. 
  

  

  C 
  

  

  Clamp 
  and 
  screw 
  for 
  index. 
  

  

  I 
  

  

  Index. 
  

  

  Eoi 
  

  

  JGH 
  Section 
  op 
  Clepsydra. 
  

  

  

  Fig. 
  IV. 
  

  

  T 
  

  

  Upper 
  tank. 
  

  

  T' 
  

  

  Lower 
  tank. 
  

  

  Y' 
  

  

  Upper 
  valve. 
  

  

  V 
  

  

  Lower 
  valve. 
  

  

  11 
  

  

  Brass 
  rods 
  connecting 
  valves. 
  

  

  B' 
  

  

  Brass 
  pipe. 
  

  

  G 
  

  

  Glass 
  pipe. 
  

  

  T" 
  

  

  Waste 
  tap. 
  

  

  S 
  

  

  Waste 
  saucer. 
  

  

  E 
  

  

  Excess 
  bucket. 
  

  

  S' 
  

  

  Graduated 
  scale. 
  

  

  B 
  

  

  Bars, 
  supports. 
  

  

  L 
  

  

  Lever. 
  

  

  F 
  

  

  Fulcrum. 
  

  

  S'" 
  

  

  Spring. 
  

  

  P 
  

  

  Peg 
  to 
  limit 
  movement 
  of 
  lever 
  

  

  F" 
  

  

  Fastening 
  of 
  spring. 
  

  

  A 
  

  

  Iron 
  arm. 
  

  

  W 
  

  

  Waste 
  pipe. 
  

  

  s 
  s 
  

  

  s 
  Stand. 
  

  

  S"' 
  

  

  Spring 
  to 
  keep 
  valve 
  shut. 
  

  

  