Trans. R. Dubl. Soc., Ser. II., Vol. VIII. Prare X. 
Aluminium Iron. 
x 120. Deeply etched. x 120. 
Edge, Ferrite layer. 
1 
N Ny +}. 
NY Vy 
Andy! iP ay ay \ 
Nan 
ait 2 
The same specimen 
‘ x 120. turned and drawn down. x 124, 
No Ferrite layer. 3 
BEMAOBE & SONS, LIMITED, DERBY, LONDON & WATFORD 
