No. 524.M. 



Universal Apparatus, Spirit Levels, Propagation of Pressure. 



335 



52 442. 1 : 3. 



52452. 1:7. 



52 453. 1 : 8. 



52 454. 1 : 6. 



Equilibrium of Liquids. 



52. 440. Tube Level Model (Weinhold's), Figure (W. D., Figs. 104 and 105 [93 and 94]), 



length 40 cm, with polished stand 0. 11. 



52.441. - - idem, stand unpolished 0. 9. 



52.442. Tube Level with metal base, Figure (W. and E. phys. Prakt., Fig. 12) ... 0. 7. 



52.443. - - idem, smaller and simpler pattern, with iron base 0. 3. 



52.444. Spirit Level in cast iron case, Figure, for perpendicular and horizontal surfaces, 

 shafts, etc 0. 8. 



Round Spirit Level, of brass, nickelled, Figure. 



List No. 52,445 52,446 52,447 52,448 



Diameter mm 25 30 40 50 



0.3.6 0.4.6 0.5.0 0.5.6 



52.449. Pressure Tube with Piston and Plugs, for showing the invariability in volume of liquids 



and the difference between liquids and gases (M. T., p. 95) 0. 2. 



52.450. Apparatus for Propagation of Pressure, hollow brass sphere with fine holes and force 

 pump placed on same, similar to Fig. 52,452 (W. D., Fig. 106 [95]), without pressure 



gauge 0.13.0 



52.451. --idem, of glass (spherical squirt) 0. 3. 



52.452. Apparatus for the Propagation of Pressure in Liquids and Gases, of brass, with Pressure j 

 Gauges, Figure 1. 0. 



52.453. --idem, on stand, Figure, with pressure gauges and stop-cock (Fr. phys. 

 Techn. I, 2, Fig. 2692) 1. 16. 



52.454. Brass Cube for Pressure Propagation, Figure, with six thin rubber membranes, 

 as suggested by Browne, with 2 stop-cocks for leading in and taking off the water or air, 



on stand (Fr. phys. Techn. I, 2, Fig. 2333) 2. 0. 



s. d. 





Cl. 701, 703, 

 702. 704. 

 70S, 3642, 706. 



