OF STEAM GAUGES, ETC. 



199 



FIG. 2318. 



FIG. 232G. 



FIG. 2319. 



2319. MEBCUEIAL VACUUM GAUGE, with scale of 21 to 31 inch., in round brass case, 



with door, stop-cock, etc. (fig. 2319) . . . . 1 15 



2320. MEECUEIAL VACUUM GAUGE, with scale of 14 to 31 inch . 1 18 



2321. SYPHON VACUUM GAUGE, with brass nut and screw, for air pumps, etc. 



040 



2322. DITTO, DITTO, with glass scale, the gauge enclosed in glass tube with stop-cock 



(fig. 2322), p. 203 . .090 



2323- Mercurial Vacuum Gauge; on mahogany frame, with adjusting scale, divided 



from to 31 inch., glass cistern, brass tube and union joint, for first-class 



engine-rooms, connecting with air pump, etc. . . 1 18 



2324. THEEMOMETEIC PEESSUEE GAUGE, on which the pressure is shown by the 



temperature of the steam from 51bs. to 701bs., about 10 inch, long, in round 

 brass case for protection . . . . . 1 15 



2325. MEECUEIAL PEESSUEE GAUGE to any length, on painted board, for showing 



pressure by the height of the mercurial column, arranged so as to prevent 

 overflow of mercury, to 201bs., 2 5s. ; to 301bs., 2 15s. and upwards, accord- 

 ing to pressure. 



2326. ImprOYCd Steam Engine Indicator, for high and low pressures, for registering 



with precisicn the rate of speed on the engine, in mahogany case, with steel 

 tap and ivory scale (fig. 2326) . . . . 5 10 



2327. IMPEOVED STEAM ENGINE COUNTEE, 'for registering the number of revolutions 



or strokes made by an engine, whether stationary or marine, up to 1,000,000, 

 with clock, in handsome brass frame, for the engine-room (fig. 2327), p. 200 



15 



