348 



Equilibrium of Liquids. 



\... .V2558 



52 558. 1 : 8. 



52 560 B. 1:6. 



52562. 1:6. 



52 560 A. 1:4. 



52 566. 1 : 4. 



52.558. Differential Hydro-Pycnometer, after Eebenstorff, Figure, without glass cylinder 

 (Ztschr. f. d. phys. u. chem. U. 17, 1904, p. 339) 



The instrument is used for accurately determining the sp. gr. from 0.5 2.0, requires only a 

 very small quantity of liquid and can be used in the preparatory and laboratory work of the teacher 

 as a precision hydrometer. It gives an opportunity for exercises on the Archimedian Principle as 

 well as for discussing the advantages and disadvantages of the various methods for determining density 

 in the preparatory practical instruction. 



52.559. Glass Cylinder for Differential Hydro-Pycnometer No. 52,558, 445 mm high, 90 mm 

 wide, all for Hydrometer No. 52,560 



52.560. Hydrometer with Centigram Spindle, after Eebenstorff (Ztschr. f. d. phys. u. chem. 

 U. 19, 1906, p. 10), Figs. A and B, of glass, in elegant case, with 5 weights each 

 for water and air in separate wood box. Price without glass cylinder (see No. 52,559) 



The Centigram Spindle is arranged so as to screw off and is provided with coloured scale. This 

 Hydrometer is specially adapted for instruction in chemistry and mineralogy, it permits of rapid 

 working. 



52.561. Pneumatic Densimeter, for determining the Specific Gravity of Liquids, after Boyle, 

 2 tubes with 1 pump, on graduated stand 



52.562. - - idem, after Mohr (Alexander Hydrometer), Figure, instead of being fitted 

 with pump, with rubber ball and valve (M. P. I, Fig. 399) 



52.563. - - idem, after Babinet, without bellows (M. P. I, Fig. 364), with 2 U-shaped tul><-s 

 and graduation for accurately reading differences of height 



s. d. 

 1. 8. 



0. 3. 6 



1. 4. 



1. 8. 

 i. :.. ii 



1. 0. 



CI. 3332, 3329, 781, 

 -. 770. 



