This notebook covers the periods December 1903 and May 1905. All entries are by Edison. The entries from 1903 relate to x-ray experiments. The enumerated experiments, slides 1- 253 and 381-388, are a continuation of those found in N-03-12-12.2. Several entries contain references to a "big book" into which some of the notes were copied. The notes and drawings from 1905 pertain to storage batteries. Included are calculations regarding the performance of a Lansden "Tonneau" automobile. There are also a few scattered phonograph drawings. The front cover is labeled "x ray." The pages are unnumbered. Approximately 170 pages have been used.

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