Discussion on “magnetic properties of electrolytic iron,” at Milwaukee, Wis., May 30, 1906

E. F. Northrup: It is well known that if aluminum has alloyed with it a small per cent. of copper the electrical conductivity of the aluminum is lowered; the addition of a metal of better conductivity to aluminum thus reducing instead of increasing its conductivity. I would like to ask if Professor Burgess has found an analagous effect in which the permeability of pure nickel is decreased by the addition to it of a small per cent. of pure electrolytic iron, or, on the contrary, does the addition of iron to nickel increase the permeability of the nickel?