294 



NEGRETTI AND ZAMBEA, HOLBOEN YJADUCT, E.G., 



s. d. s. d. 



1171 Leather Case and Strap for Prismatic Compass . . 7 6 10 6 



1172 Stand for Prismatic Compass, best mounted, Ordnance pattern, 



with ball-and-socket joint . . . . . . . 1 16 



1173 Ditto ditto, plain horizontal movement 180 



1174 ' Hutchinson's Prismatic Compass, 3-inch, in Leather Sling Case 



(fig. 1174) 2 10 



1175 Tripod Stand for Prismatic Compass, with ball-and-socket 



movement . . 1 12 



FIG. 1177. 



FIG. 1177* 



FIG. 1158. 



1177 



1178 



1179 



1 16 



Improved Telescopic Prismatic Compass (figs. 1177, 1177*). By it 

 both Vertical and Horizontal Angles can be taken with speed 

 and accuracy Price in Mahogany Box 12 12 



Tripod Stand for ditto with ball-and-socket movement suited for 

 either of above Compasses ........ 



See also Section Pocket Compasses. 



Standard Mountain or Surveying Barometer (fig. 1179), on Fprtin's principle, 

 is more portable, and less liable to derangement than ordinary Mountain Baro- 

 meters. The arrangement of the flexible leather cistern is so simple, that should the 

 mercury become oxidized, it can be quickly removed, cleaned, and returned to the 

 cistern without fear of affecting the correctness of the indications. The vernier 

 reads to *002 of an inch, and the whole instrument is arranged in a compact and 

 convenient form for safety in travelling, and obtaining the most accurate Altitude 

 measurements. 



Price, including Tripod Stand (as fig. 1179, or fig. 12, page 13) and stout Leather 

 Travelling Case for the Barometer, &c ........ 10 10 ' 



See also pagv 10, Meteorological Instruments. 



