45, CORNHILL, E.G., AND 122, KEGENT STEEET, W., LONDON. 



291 



1154 



FIG. 1153. FIG. 1148. FIG. 1154. 



Circumferenter, 6 -inch, or Hedley's inclining dial, improved form, folding 

 sights, two spirit levels, bar needle with agate centre, rack adjustment 

 to dial, two verniers reading to three minutes of a degree, tangent screw 

 adjustment, divided arc for hypo and base, with 'plain sights, complete 

 with ball-and-socket stand, joint legs for use at half length, extra points, 

 plummet, &c., &c., in case complete (fig. 1154) . . . .17 17 



Circumferenter, Hedley's Improved, with Telescope, parallel plates 25 



1155 



Circumferenter, Lean's 6-inch, improved, with Telescope, for surface 

 surveying, centre quadrant, with level, shifting sights ; vernier reading to 

 two minutes, bar needle, cross levels, rackwork adjustments, arc divided 

 on one side 90 each way and on reverse for hypo and base, jointed 

 stand with extra points, &c. fig. 1155 18 18 



17 2 



