OF SPECIFIC GEAVITY INSTRUMENTS. 



215 



O 



FIG. 2538. 



o 



FIG. 252G. 



FIG. 2527. 



FIG. 2505. 



2520. SaliilOinetcr Hydrometer, best glass, adjusted to 200 Fahrenheit (or Centi- 

 grade or Reamur), if required, for showing the quantity of salt in the hoilers of 

 steam engines, and the proper time for blowing it off, in tin case 4 



2522. DITTO, DITTO, of gilt metal, in tin case . . . 18 6 



2523. DITTO, DITTO, in mahogany case, with thermometer . . 160 



2524. THEBMOMETEB, protected, etc., for ditto . . . 040 



2525. ENGINE COUNTERS OB METEBS for steam vessels, see steam gauges, Nos. 2327 



to 2334. 



2526. Milk Test or Lactometer, for detecting adulteration, and showing the relative 



value of milk from different cows (fig. 2526) . . 036 



2527. CBEAM TEST, for showing the difference in quantity of cream between one cow 



and another, with instructions also for the lactometer (fig. 2527) 036 

 No one using these appliances would ever again be without them. 



2528. ACETOMETEB, for vinegar and other light acids . . . ' . 



2529. BABKTBO METER, with open graduations, for tanning 



2530. OLEOMETEE, for testing the quality of oils, in round case 



2532. DITTO, with thermometer and glass jar, in mahogany case 



2533. Hydro meter, for showing the specific gravity of salt-water, from to 40, as 



de signed for and supplied to the Admiralty and United States Government 

 by L. CASELLA .- . . , , 040 



16 



