64 



L. CASELLA'S CATALOGUE 



FIG. 409. 



LEVELS, 



405. Level, 12-inch., with parallel plates, divided silver ring to compass, two eye- 



pieces, screw drivers and levers, tripod stand, etc., complete in mahogany 

 case ........ 12 & 



406. Y. LEVEL, 15-inch., complete as above . . . . 13 10 



407. Y. LEVEL, 18-inch., complete as above . . . . 15 (> 



408. Y. LEVEL, 20-inch., complete as above . . . . 18 



409. Gravatt's, OF Dumpy Level, 10-inch., with parallel plates, divided silver ring 



to compass, tripod stand, etc., complete in mahogany case (fig. 409) 13 10 



410. GEAVATT'S LEVEL, 12-inch., complete as above . . 14 



411. GEAVATT'S LEVEL, 14-inch., complete as above . . 14 10 



412. dravatt's level, 16-inch., largest size, with extra large telescope, 2-inch, object 



glass, 5-inch, compass, etc., complete as above . . 15 15 0" 



*#* Either of the above four levels, without compass, l 10s. less. 



413. A SIMPLE LEVEL, with parallel plates and one eye-piece, in mahogany case, and 



light tripod stand . . . . . . 600 



414. Tronghton's Level, 14-inch., with compass and tripod stand, complete 11 10 



415. TEOUGHTON'S LEVEL, 20-inch., complete as above . . 13 10 



416. DEAINAGE LEVEL (!HPEOVED), with superior telescope, cross lines etched on the- 



glass, ball and socket joint, tripod stand, and station staff complete, as strongly 

 recommended by the Royal English, the Royal Irish, and the Highland 

 Agricultural Societies, in mahogany case (fig. 416), p. 65 . 5 5 



417. Drainage Level, brass, with plain sights, and ball and socket joint, in plain case- 



140 to 2 8 



419. Mountain Barometers AND CASELLA'S IMPEOVED HYPSOMETEICAL APPAEATUS, 

 being now much used by travellers abroad as handy and reliable for 

 measuring heights in rough mountain districts, may be also classed amongst 

 surveying instruments. See Nos. 15, 16, 85, and 86, also the Mariotti, or 

 Boylean pocket standard barometer, No. 88 and Addenda. 



