The Aerophor (not Aerophon) was a foot operated bellows device that would blow air into a corner of a players mouth to enable infinitely long notes and phrases.
It not only provided air but humidified and warmed it to body temperature.
The diagrams show that one closed the soft palate at the back of one's mouth and relied entirely on the Aerophor to supply the horn, while breathing from the nose to the lungs.
I wonder how well that would work given that the throat is an essential part of the whole wind instrument sound production system.
It was ostensibly patented, so there must be a diagram somewhere that would permit us to recreate this wonder.
(see article link for more pictures)
![Image](https://2.bp.blogspot.com/_jJDUiooC8vo/TF8Jc7HJPYI/AAAAAAAAAsk/ZRpjuFRA-s8/s1600/Aerophor+4,+Artificial+breath,+Techn.+Wrld.jpg)
![Image](https://1.bp.blogspot.com/_jJDUiooC8vo/TF7389AN1qI/AAAAAAAAAsM/-xRYuhlwA04/s1600/Aerophor+3b.jpg)