Canaries, which are popular as pets for their beautiful cries, have been using canaries in coal mines to detect toxic gases in coal mines by using the fact that their cries stop when the concentration of carbon monoxide and toxic gases is high. Many people may think canaries are cute after hearing the episode of Canary in the Coal Mine, but the National Museum of Science and Industry in London has a canary resuscitator cage built to save canaries in the coal mine.
British physiologist John Scott Holden conducted an investigation into the toxic fumes that killed many mine workers in the late 19th century. And he looked for a way to detect colorless and odorless gases before they harm humans. Eventually, a method was devised to bring canaries in cages into the mines. Canaries keep ringing if there is no problem with their body, so if you smoke gas, they not only fall from the tree, but also stop crying and notice abnormalities in hearing.
Canaries in coal mines have been used in mines even in the late 20th century, and were finally replaced by electron gas detectors in England in 1986. Many mine workers are said to have liked canaries going down the shaft together, and replacing them with electronic gas detectors discouraged some workers.
In fact, in the cage with canary resuscitation device made of aluminum, which is housed in the Museum of Science and Industry, a grill is installed at the entrance so that the canary cannot escape, and when the canary shows signs of carbon monoxide poisoning, the entrance is closed and oxygen is released from the upper cylinder to revive the canary. all. Related information this placecan be found in