40 L. CASELLA'S CATALOGUE 



must greatly curtail the length of this list. Besides, however, the rigid form suggested at 

 the above conference and adopted by our Government, as shown in^g-. 13, p. 5, a few other 

 ornamental kinds as^. 136, p. 59, continue in use, being still liked for their handsome 

 appearances. As weather instruments also, when of proper make, they are undoubtedly 

 excellent, though their general construction does not admit of their indications being 

 comparable with the same decree of precision as in the pattern adopted by our 

 Admiralty authorities. 



136. Marine Barometer, bow front, neatly carved (fig. 136, p. 39), with thermometer 



in front, ivory plates, double rack, verniers reading to 100th of an inch, 

 revolving in centre ring and brass gimbals, complete, rosewood, mahogany, or 

 oak 3 15 



137. Marine Barometer, bow front, as 136, single rack and gimbals, complete 350 



138. MAEINE BAEOMETEE, in solid rosewood frame, round top, thermometer in front, 



double rack, ivory scales, vernier reading to 100th of an inch, protected with 

 stout plate-glass, etc. . . . . . 3 10 



139. Marine Barometer, complete, with single rack-work . . 330 



140. MAEINE BAEOMETEE, of plain simple construction, perfectly reliable, in solid 



mahogany, with ivory plates and gimbals, complete . . 220 



142. Marine Station Sympiesometer, in bold oak frame, the scale elongated to about 



three times the usual length, adapting it as a valuable guide where more 

 expanded graduation and greater sensitiveness are required . 4 10 



143. MAEINE BAEOMETEE AND SYMPIESOMETEE combined, by which the indications of 



each are at all times comparable, the tubes of both being contracted to prevent 

 oscillation ; rack- work to sympiesometer, and double rack- work to barometer ; 

 very handsome, in rosewood, walnut, etc., with gimbals, complete (fig. 143, 

 p. 39) 6 10 



144. Sympiesometer (CASELLA'S MUCH IMPEOVED) especially arranged for use at sea, 



the tube contracted to prevent oscillation in stormy weather, in solid rosewood 

 case with stout plate-glass front, the scale reading to the 50th of an inch 

 (fig. 144, p. 39) . . . . , . 330 



For Mountain Sympiesometer, see No. 123. 



145. The Fisherman's or Storm Barometer, as expressly approved by Admiral 



Fitzroy, Board of Trade, etc., for Lifeboat Stations -> . 550 



This instrument consists of a strong tube with large bore, and very correct and bold 

 thermometer mounted in a solid oak frame, firmly screwed together. The scales are of 

 porcelain, boldly engraved, and impervious to any injury from the weather ; the vernier reading 

 is to 1'lOOths of an inch. It is strongly recommended as a sound and excellent instrument, 

 admirably adapted for the sea coast and public institutions. 



146. MINEE'S BAEOMETEE. The numerous accidents occurring in coal mines in 



particular, and the close connection of these with diminished atmospheric 

 pressure, as shown by a low state of the barometer, has induced L. CASELLA 

 to arrange an economic and highly portable form of instrument for this 

 purpose ; it is plain, hardy, sensitive, and adapted alike for all climates. 

 No manager of mines should be without it . . . 1 10 



147. Miner's Barometer, more elaborately finished . . 220 



