-No. 52719. 



Universal Apparatus. Displacement in Space. Specific Gravity. 



367 



52712. 1:4. 



52 713 B. 1:7. 



52 717. 1 : 5. 



52 713 A. 1:5. 



52 718, 52 719 52 721. 1:10. 



52,715. Glass Tube, for determining the Specific Gravity of Gases, after Friedr. C. G. Miiller s. d. 

 (M. T., Fig. 83), for use in conjunction with pressure level No. 52,731 0. 6. 



.")!', 716. - - idem, for the Grimsehl Gas Balance, with 3-way cock (Ztschr. f. d. phys. u. 



chem. TJ. 18, 1905, p. 200), for use with the Spirit Level Pressure Gauge No. 52,732 0. 3. 



52.717. Baroscope after Schoentjes, Figure, for showing the Buoyancy of Air, with counter- 

 poise (Fr. phys. Techn. I, 2, Figs. 2708 and 2708 a; Ztschr. f. d. phys. u. chem. U. 14, 



1901, p. 166) 1. 5. 



By increasing the hermetically closed hollow body it is shown that this appears lighter when 

 it displaces more air. If air is allowed to force its way inside, the body then appears heavier. 



52.718. Apparatus for Experimental Measurements with Air Balloons, Figure, after Eeben- 



storff (Ztschr. f. d. phys. u. chem. U. 19, 1906, p. 98), complete, without clamping stand 2. 0. 



For experimental measurements on the buoyancy of balloons filled with hydrogen or house gas. 



The apparatus consists of 2 tubulated glass flasks with rubber connecting tubing; 1 clamp for tubing; 

 1 perforated rubber stopper; 1 glass tube with stopcock; 1 rubber bellows; 1 glass tube in stopper; 

 1 piece thin walled tubing; 4 rubber balloons; 2 pieces chain; 1 adjustable small table; 2 small glass 

 stoppers; 2 distance pieces; 1 rule and 1 sheet iron case with projecting lid and moistening flask. 



52.719. Single Constituents of preceding Apparatus, see Fig. 52,718, without clamping stand j 1. 8. 



2 tubulated glass flasks with rubber tubing; 1 rubber stopper; 1 glass tube with stopcock; 1 small 

 adjustable table and 1 sheet iron case with overlapping lid and with moistening flask. 



Cl. 842, 843, 5534, 844, 

 3651. 



