The great German physicist, Nernst, found that the longer an electric current was made to flow through a filament of oxide of magnesium, the greater became the conductivity of the filament.

• （著名的德国物理学家Nernst曾发现在氧化镁的细丝中通过电流的时间越长，那么这根细丝的导电性就越好。）