27 October 2014
Firefighters' rescue masks - updated
From France "between the mid-1800s and World War I."
I see adapters designed to fit onto some type of tubing, presumably leading either to fresh (?compressed) air since an oxygen source would have been exponentially risker to a firefighter.
Via Not In The History Books.
Addendum: A tip of the blogging hat to reader Aleksejs, for sending me a link to the Firefighting Museum in Riga, Latvia and to this photo of a complete similar-type outfit from the same era: