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ANTIQUARIAN HARMONOGRAPH BOOKS
Two antiquarian books all about the Harmonograph.
"The Harmonograph" by Irwin Whitty was privately printed in 1893, and contains
original drawings from a harmonograph made by the author.
"Harmonic Vibrations" edited c. 1909 by Herbert C, Newton, a manufacturer of scientific instruments.
These PDFs are freely available to download for personal use only.