EVB2937541: Electrical generators in Edison Sault Power Plant at Sault Ste. Marie, Michigan were powered by the 21 foot drop of Saint Mary's River between Lakes Superior and Huron. The power plant was the longest in the world in 1902 and it's generating power was exceeded only by the Niagara Falls works / Bridgeman Images
EVB2937638: Electrical outlets in an American home during World War II. The photo was released with the following conservation instructions: 'How to add years to the life of your electric cords: remove them gently but firmly from wall sockets. Don't pull or tug. When not in use, coil cord loosely around a hook.' 1943 / Bridgeman Images
EVB2937682: American television inventor, Philo T. Farnsworth testified to a Congressional committee about the difficulties in getting patents. Farnsworth is seated between George Everson, Secretary of Farnsworth Television, Inc. and Richard C. Patterson, Jr., Assistant Secretary of Commerce. January 1939 / Bridgeman Images