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These twenty-nine notebooks, which generally measure about 3" or 4" in one direction and 6" or 7" in the other, contain notes, drawings, and calculations by Edison relating to a variety of topics, including storage batteries, phonographs and phonograph records, cement, x-ray tubes, and other experimental apparatus. Most of the entries describe experiments or other matters to be undertaken at the West Orange laboratory. There are also some speculative notes concerning electricity, acoustics, electromagnetic radiation, and thermodynamics, as well as occasional entries by other employees or experimenters. A few books appear to have been used by Edison at his winter home in Fort Myers, Florida.