Final answer:
Louis Le Prince is credited with the first electric picture transmission, recording the earliest movie still in existence. Thomas Edison and George Westinghouse made significant contributions to the development of electric power, which enabled the progression of electric picture transmission technology.
Step-by-step explanation:
The credit for the first electric picture transmission often goes to the innovator who successfully combined motion-picture cameras with photographic film to create an early form of movies. Louis Le Prince, a French inventor, patented a motion-picture camera that relied on photographic film and managed to record the first movie still in existence, which was a scene of people walking in a garden in England. This significant milestone came after the advances made in photographic technology, as well as electricity being more widely applied in communications and lighting.
To understand the context, we must reflect on the contribution of Thomas Edison, who, while not directly credited with the first electric picture transmission, played a pivotal role in the development of electrical devices. Edison is known for his invention of the lightbulb, the phonograph, and his impact on the U.S. film industry with films such as 'The Great Train Robbery'. His work with electric power helped pave the way for innovations in electric picture transmission.
It is essential to acknowledge that George Westinghouse's promotion of Alternating Current (AC) was instrumental in expanding the reach of electrical power, making technologies like motion-picture cameras readily accessible beyond immediate vicinities of power sources.