OF GAS GAUGES, ETC. 



203 



FIG. 2366. 



FIG. 2322. 



FIG. 2364. 



2352. LARGE SIZE INSPECTORS' GAUGE, with bent brass work, ground elbow and socket 



with 3 adapters and extra elbow adapter, much used by the London Gas 

 Company, complete (fig. 2352), p. 202 ... 1 12 6 



2353. DITTO, DITTO, with small tap and burner . . . 1 15 6 



2354. Ring's Pedestal Pressure Gauges, in form of small time-piece with circular dial, 



in which the whole circle of each gauge is employed, in neat ornamental forms; 

 for 3 inch, pressure, 1 15s. ; for 6 and 12 inch, pressure, 2 10s. ; for 24 

 inch, pressure, 3 3s. ; 36 inch, pressure . . . 4 4 



2355. GAS THERMOMETER, 8-inch, scale, in brass case, straight for horizontal pipes, 



with ground scx-ket and screw plug (fig. 2355), p. 202 . 110 



2356. DITTO, DITTO, bent, for perpendicular pipe, with socket and plug, as above 



(fig. 2356), p. 202 . . . . . . 120 



2357. EXTRA SOCKETS AND PLUGS (fig. 2357), p. 202, each . . 020 



2358. SENSITIVE THERMOMETER, small size, on neat ivory scale, 4 inch, extreme with 



projecting bulb for taking the temperature of gas in pipes, etc. 046 



2359. DITTO, DITTO, with ground socket and screw plug . . 086 



2360. SEPARATE GROUND SOCKETS with screw plugs, each . . 040 



2362. Specific Gravity Apparatus, consisting of light balloon of 1 cubic foot capacity, 



proof scales, with grain weights, each grain being equal to the weight of 

 1*728 cubic inches of air, in case complete . . . 250 



With this apparatus the difficulties of taking the specific gravity of coal gas are removed, 

 and reduced to a simple operation of a few minutes. 



2363. EXPERIMENTAL METER AND PILLAR, the pillar having micrometer adjustment, 



and pressure gauges affixed, with 2 regulating cocks, and large tube pressure 

 gauge . . . . . . . 5 14 



2364. Inferential or Jet Photometer (LOWES'), for measuring the illuminating power 



of gas. In this arrangement the length of the gas flame from the photometer 

 is constantly measured by the graduations on the attached glass chimney, and 

 the uniformity of pressure shown by the index on the graduated circle (fig. 236 1). 

 This gauge is a decided favourite with the managers and practical men of the 



various gas works around London 



3 15 



