286 



NEORETTI AND ZAMBEA, HOLBOKT? YIADUCT, E.G., 



FIG. 1120. 



SURVEYING AND DRAINAGE LEVELS: 



1119 10-inch best Dumpy or Gravatt's Level, with Achromatic Telescope and 



rackwork adjustment, divided Silver Ring Compass, mirror and cross 



Level, strong brass parallel plates, with mahogany tripod staff, 



.and case .. 13 13 



1120 12-inch ditto (fig. 1120) ... 14 14 



1121 14-inch ditto ditto ... 16 16 



1122 18-inch ditto ditto ... 18 18 



1123 24-inch ditto ditto . 22 

 Dumpy or Gravatt's Levels, without Compasses : 



1124 10-inch ditto ditto ... 12 10 



1125 12-inch ditto ditto ... 13 10 



1126 14-inch ditto ditto 15 10 



FIG. 1127. 



FIG. 1130. 



1127 



1128 

 1129 



Best Y Level, with 12-inch Achromatic Telescope and rackwork adjustment, 

 Compass, tangent screw adjustment, parallel plates, in case, with tripod 



staff (fig. 1127) 17 17 



Best Y Level, with 18-inch Telescope .... 18 18 



Ditto ditto, with 24-inch Telescope .... 22 



