382 



Equilibrium of Gases. 



No. 52 857 



52866. 1:8. 



52 869. 



1 : 9. 



52 860. 1 : 10. 



52863. 1:10. 



52 868. 1 : 5. 



52.857. Heron's Ball with Force Pump, entirely of metal, with spring pressure gauge, F i g u r-e 



52.858. Heron's Fountain, of glass, with base, Figure 



52.859. Heron's Fountain, with wood stand, Figure 



52.860. Heron's Fountain, large, Figure, with metal mounting, durably constructed, can 

 be taken to pieces (Gan.-Man., Fig. 200) 



52.861. Intermittent Fountain, of glass. Figure (W. D., Fig. 155 [142]) 



52.862. - - idem, with iron stand 



52.863. -- idem, large pattern, witli metal mounts and metal basin, Figure . . . . 



52.864. Cartesian Diver, in cylindrical glass vessel with rubber bung 



52.865. - - idem, after Weinhold (W. D., Fig. 156 [143]), with glass cylinder 



52.866. Cartesian Diver, Figure, in glass cylinder with metal screwed union and force pump 



Cl. 4'J79, 906, 907, 

 908, 5835, 910, 



S. 

 1. 10. 



0. 8. 



II. IS. 



2. 111. 



o. ;;. 



0. 6. 



1. 1 I. 

 0. 2. 

 (I. 4. 



(I. 12. 



911.913, 

 912. 



