Hele-Shaw & Hay. 
Phil. Frans., A., Vol. 195 , Plate 17 . 
Elliptic Cylinder. Ratio of axes 2:1, major 
axis inclined at 45° to field. Theoretical 
Diagram. Permeability = 100. 
Elliptic Cylinder. Ratio of axes 3:1, major 
axis inclined at 45° to field. Stream-line 
Diagram. Permeability = 100. 
23 
Flat Elliptic Plate, inclined 45° to field. 
Permeability = 100. 
24 
Hollow Elliptic Cylinder. 
Major axis inclined 45° to field. 
Permeability = 100. 
