| N. Harvey observed no voltaluminescence with nickel. R. D. Kleeman and W. Fredickson studied the electrical charges on colloidal particles of nickel in distilled water; A. Coehn and A. Lotz, and P. E. Shaw and co-workers, the Motional electricity or triboelectrical effect of nickel against glass, etc.; W. A. Rudge, the production of electrically charged dust when nickel is spluttered in air in a brass tube; and J. B. Seth and co-workers, the e.m.f. developed when nickel and steel are in contact and in relative motion. P. A. Mainstone studied the effect of heat treatment. |