66 



L. CASELLA'S CATALOGUE 



FIG. 427. 



FIG. 431. 



439. Levelling Staff, Gravatt's, 17 feet, 3-draw . . . 2 15 



440. letford's Levelling Staff, 13 feet . . . . 330 



441. LEVELLING STAFF, half-round, for hot climates, with improved readings by which 



they are clearly visible at full one half greater distance than those of ordinary 

 make, especially arranged for India by Colonel A. Strange, F.R.S., chief of 

 the Scientific Department of the Indian Government 3 3 



442. LEVELLING STAFF, 14 feet, 3-draw, half-round, as especially made for the 



Ordnance and Indian Government (SOPWITH'S) . . 3 3 



The above staffs are figured and divided on sheets thoroughly prepared against wet, 



and all the influences of climate and the weather ; some, however, prefer them painted on 



the wood, in which case they are 10s. each extra. 



They are also painted in foreign measure as Metric, Danish, Ehineland or Prussian, at 



3s. each extra. 



443. Levelling Staff, 10 feet, folding in two, light and handy, for drainage 



levelling . . . . . . . 140 



444. LEVELLING STAFF, as above, 8 feet . . . . 120 



PRISMATIC, SURVEYING, AND MINING COMPASSES, ETC. 



445. Prismatic Compass, with sights plain, in maroon or sling case, l|-inch, 140; 



2-inch., 1 8 6; 2|-inch., 1 13 6 ; 3-inch., 1 18 6; 3|-inch., 2 2 6; 

 4-inch v$ -:>;" . 260 



446. PRISMATIC COMPASS, with sights, shades, and mirror, in maroon or sling case 



(fg. 446) ; p. 67, l^-inch., 1 10 ; 2-inch., 1 18 6 ; 2-inch., 236; 

 3-inch., 286; 3i-inch., 2 13 6 ; 4-inch. . " . 2 16 



Either of the above with extra light aluminium ring, 10s. to 14s. additional. 



447. Prismatic Compass Tripod Stand,, plain, with horizontal motion 156 



448. PRISMATIC COMPASS TEIPOD STAND, with ball and socket joint for horizontal and 



vertical motions . . . . . ~, 1 12 



449. PRISMATIC COMPASS, 2f-inch., with sights, aluminium ring, in maroon case ; 



Ordnance and War Office pattern . . . . 2 10 



450. Eater's Azimuth Pocket Compass, with magnetic floating card and folding 



sight, for estimating angular distances on land or at sea . 2 10 



