312 



NEGRETTI AND ZAMBRA, HOLBOEN VIADUCT, E.G. 



FIG. 1322. 



FIG. 1324. 



ARTIFICIAL HORIZONS. 



1322 Black Glass Plane, or Artificial Horizon, with three 



Levelling Screws, and Ground Spirit Level in box 

 (fig. 1322) 



1323 Artificial or Roof Horizon, with Wood Mercury bottle 



and Trough 



1324 Artificial Horizon, Ordnance Pattern, with two Troughs, 



turned Iron Mercury Bottle, complete in mahogany 

 box (fig. 1324) 



SUN-DIALS. 



s. a. 



2 10 



3 10 



4 10 



1325 Sun Dials, circular, best Brass, 

 full divided to 5 minutes, with 

 Equation Table, and hand- 

 somely engraved (fig. 1325) : 



"Diameter 10-in. 12-in. 14-in. 18-in. 



Price 84s. 115s. 160s. 263s 



FIG. 1325. 



