Screen Amalgamation and magnetic test: 
Curves showassays of Non-Magnetic and 
Magnetic, 
a ts |e 
Magnetic Ree 
Aperture 1.89 -907 RIC ENCE .206 137 -089 —.089 
Mesh 10 20 40 60 80 100 150 — 150 
Fic. 5. 
