Hydrogen, 
0-819 — log. 6 6 
Air 
Pressures with Meerschaum 
L,— t . t !> ,1 1 I V 'f 
Pressures with Stucco. 
® Meerschaum 
x Stucco 
Phil. Tram. 1879. Plate 47. 
Dioogrcum. I. 
Reynolds. 
West Newmaai& C° lith. 
