This pocket notebook was used by Charles Batchelor. The dated entries cover the period March 1888-January 1890 and relate to toy phonographs and to recording styli for phonographs. The front cover is inscribed "Toy Phono." The pages are unnumbered, and the book has been used in both directions. Approximately 40 pages have been used.
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[NP054A], Technical Note, Charles Batchelor, March 1888 1888-03-00
[NP054B], Technical Note, Charles Batchelor, January 1890 1890-01-00