Watch how 19th-century Genaille-Lucas calculating rulers work https://boingboing.net/2018/01/31/watch-how-19th-century-genaill.html …pic.twitter.com/qar0ONqwIB
5:18 AM - 31 Jan 2018
0 replies
5 retweets
7 likes
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.