Hydraulic Presses. Increase o! Pressure. Bottom Pressure. 



339 



52473. 1:3. 



52 476. 1 : 8. 



52 479. 1 : 5. 



52,475. Pressure-Increase Apparatus (Hartl's), Figure, for showing the internal pressure- 

 relations in a liquid (Ztschr. f. d. phys. u. chem. U. 9, 1896, p. 120) 



The inferior part of a glass tubs is connected to a pressure-chamber shut by 2 membranes and 

 turnable about a horizontal axis; in the superior part is fixed a manometer with scale. 



5iM7i. Pressure-Increase Apparatus, after Hartl, with Pointer Reading, Figure (Ztschr. 

 f. d. phys. u. chem. U. 8, 1895, p. 204), complete, with glass vessel and bridge . . 

 The apparatus is used for showing (1) the increase of pressure downwards, (2) the independence 

 of pressure on the inclination of the compressed surface towards the level, (3) the dependence of pres- 

 sure on the density of the liquid. 



52.477. Weighted Flask with Gauze Seal, after Eebenstorff, for depth measurement and 

 demonstrating the inertia of water (Ztschr. f. d. phys. u. chem. U. 21, 1908, p. 107); 

 capacity of flask, 100 ccm 



52.478. Apparatus for proving Pascal's Law, after Friedr. C. G. Muller (M. T., Fig. 62 and 119), 

 to be used as an analogon of the Ordinary Barometer and of the Siphon Barometer . 



The following are immersed in an upright cylinder filled with water: (1) 1 barometer tube open 

 at both ends, this being placed under the water in a dish containing mercury; and (2) 1 unequal-limb 

 hooked tube, which has to be filled with some mercury. 



5L > .17!. Pascal's Apparatus, for showing that the pressure of liquids depends on their height 

 and the surface of the bottom of the columns and not upon the capacities of the vessels, 

 improved by Weinhold, Figure (W. D., Fig. 110 [99]), with 4 different tubes . . 



s. d. 

 1. 0. 



3. 0. 



0. 5. 



0. 8. 



3. 5. 



Cl. 712, 713,714,715, 

 4123,5*31. 22* 



