Edison's laboratory developed the Kinetoscope (a motion picture viewing device) and the Kinetograph (a motion picture camera), contributing significantly to the early development of cinema. These devices paved the way for the modern film industry.

Edison invested in iron ore mining technology but faced challenges due to low-grade ore and competition from other mining operations. This venture proved to be less successful than his earlier inventions.

During World War I, Edison served as the head of the Naval Consulting Board, advising the U.S. Navy on technological advancements and defense strategies. He contributed to the development of submarine detection devices and other military technologies.

Even in his later years, Edison remained active in research and experimentation, focusing on areas such as rubber production and other industrial processes.