What is Nostr?
Joanna Holman /
npub1quk…u8vv
2024-03-07 23:40:46

Joanna Holman on Nostr: Before there were electronic tools to do it miners used to take canaries down coal ...

Before there were electronic tools to do it miners used to take canaries down coal mines to serve as an early warning of carbon monoxide build up. Some of the miners loved their canaries so much they built portable sealed cages with little oxygen tanks to resuscitate their canaries during the evacuation

https://blog.scienceandindustrymuseum.org.uk/canary-resuscitator/
Author Public Key
npub1quks336zvvyrv5h3yeh6whaylpagc3wd8zhhfqwr9ah6gx3yv7asgzu8vv