374 



Equilibrium ol Gases. 



N.I. :V2786 



\s 



52 786. 1 : 7. 



52 787. 1 : 9. 



52 788. 1 : 7. 



52 790. 1 : 7. 



52,786. Fortin Station Barometer, Figure, in metal case, tube 19 mm internal width, vernier 

 reading to 1 /, th mm and movable with rack; reading of vernier and level facilitated by 

 mirror illumination. The thermometer is in direct contact with the barometer tube 

 and can be read from the outside. The instrument is suspended on a hook and can be 

 centred at the lower end . 



.">!'. 787. -- idem, with tube 12.5 mm wide, Figure 



52.788. Travelling and Altitudinal Barometer, after Fortin, F i g u r e, with tube 10 mm width, 

 vernier giving Vio th """ wit h thermometer, Stand and Universal Suspension, also leather 

 case 



52.789. -- idem, as Station Barometer, on -wood board, Figure (i. o. o 



1 s. (1. 



IS. 10. 

 10. 0. (I 



7. 10.11 



01. 865. 866, 867. 868. 869. 





