SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Electroscope experiment. This simple version of an electroscope, designed to detect electric charge, is described as a glass flask with a stopper containing a metal rod. At the upper end of the rod (outside the flask) is mounted a ball. At the other end (inside the flask) strips of aluminium foil (or other lightweight metal) are mounted on a hook. When an electric charge is brought near the electroscope, the foil strips move apart or stick together. Here, the charge is static electricity from the crinkled paper at top. Artwork from the seventh volume (first period of 1891) of the French popular science weekly 'La Science Illustree'.
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