No. 52 875. 



Heron's Ball, Heron's Fountain, Suction Pumps, Force Pumps. 



383 



\ 



52 870. 1 : 5. 



52875. 1:9. 



52 873. 1 : 6. 



52 874. 1 : 4. 



52.867. 6 Glass Tubes, for setting up as a .Cartesian Diver (M. T., Fig. 69) 



52.868. Model of a Suction Pump, Figure, with movable piston and movable valves . 



52.869. Model of a Suction Pump, of glass, Figure 



52.870. - - i d o m, with metal stand, Figure 



52.871. --idem, of glass and metal, Figure 



52.872. Model of a Suction Pump, large and massive pattern, Figure, with brass valves 

 visible at a distance, with iron stand; total height: 67 cm; diameter of cylinder: 57 mm 



52.873. Model of a Suction Pump, French form, Figure, finely constructed 



52.874. Suction Pump, with electric motor drive, Figure 



For 4-volt D. C. current consumption = 1 ampere. 



52.875. Model of a Force Pump, of glass, Figure 



s. d. 



0. 1.0 



1. 4.0 



0. 3. 

 0.12.0 



1. 8.0 



3. 4.0 

 3.12.0 



2. .0. 



0. 3.6 



Cl. 914, 915,916, 

 917,923,5884. 



