Facts
- Author
- Playtner, H. R.
- Language
- English
- Project Gutenberg No.
- 21978
- Released on Project Gutenberg
- June 30, 2007
- Bookshelves
- Technology, Engineering & Technology
- Subjects
- Clocks and watches – Escapements
- Public domain in the USA
- yes
Sources: Project Gutenberg catalogue (public domain), Wikidata (CC0)