Magneto-Electric Illumination

Sir William Crookes, OM, was a British chemist and physicist. He worked on spectroscopy. He was the founder of vacuum tubes, inventing the Crookes tube, which was made in 1875. Crookes was the inventor of the radiometer, which today is made and sold as a novelty item.
The main troubles in the employment of magneto-electric currents for industrial aims were their almost instantaneous character and the rapid alternation in their direction. The author of the book offered the new way to overcome it. What was it? Read the book to know!