Subject
3 free books about phonograph, free to read online. Chapter 1 of any book is free, no account needed.
Development of the Phonograph at Alexander Graham Bell's Volta Laboratory Contributions from the Museum of History and Technology, United States National Museum Bulletin 218, Paper 5, (pages 69-79)
Leslie J. Newville
The telephone, the microphone & the phonograph
Th. Du Moncel
Le Téléphone, le Microphone et le Phonographe
