SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Prototype electric clock, 19th century artwork. The cogs and gears of this clock (down centre) are driven by the four electromagnetic induction coils (cylinders, one at upper left). This mechanism was first invented in 1840, but practical problems led to a lack of success. The first practical electric clock was patented in 1906, using self-contained batteries. Artwork from The Circle of Sciences, London, 1862-67.
Model release not required. Property release not required.