# Microphone

Free to read here, from Project Gutenberg.

2 titles; page 1 of 1.

- [The telephone, the microphone & the phonograph](https://invisiblenetwork.ai/books/gutenberg/75683) by Th. Du Moncel, comte
- [Le Téléphone, le Microphone et le Phonographe](https://invisiblenetwork.ai/books/gutenberg/27574) by Th. Du Moncel, comte