196 



L. CASELLA'S CATALOGUE 



FIG. 2300. 



2294. IMPEOVED BOTTLING APPARATUS . . . v 900 



2295. DIAL PEESSURE INDICATOR . . . . . 400 



2296. Improved Acid Tap, for sulphuric and other acids. In this tap the working 



parts are composed of stout glass and lead, it is thoroughly efficient, practical, 

 and durable, and indeed free from all the defects known to exist in the various 

 acid taps in use ; it supersedes them wherever it is tried . 2 17 6 



2297. SMALL GAUGE, for testing the pressure of the waters when bottled, see No. 2308. 



2298. WIEE MASK, for protecting the head whilst bottling . ' -. 056 



2299. WIEE GAUZE SPECTACLES 020 



STEAM PRESSURE GAUGES. 



IMPROVED PATENT DIRECT ACTING PRESSURE AND 

 VACUUM GAUGES. 



The great improvement in these gauges consists in the pressure, whether of steam 

 or water, being direct, by means of a small elcngated endless screw with intervening 

 diaphragm, pressing upon the spring; in this way the whole circle of the gauge is 

 employed, for whatever pressure (high or low) it is made to indicate, see fig, 2300. 

 The metallic spring, etc., in the Bourdons, being dispensed with, they can neither 

 become strained or distorted. They are equally suitable for all positions, stationary 

 or otherwise, and cannot be injured by frost as water does not remain in them ; 

 the principle admits of their being made of the small size of fig. 2305 for pocket 

 gauges with the same precision as if made of the ordinary size without increasing 

 the cost. 



2300. Metallic Pressure Gauge, as above, in handsome brass frame 3 or 4 inch. 

 (jfa.2300) . . 100 



