Robert, I don't know if this will help. Here is a link to the US Patent office application by Rene Cozette in 1924. In it, Cozette describes the detail and workings of the unit.
http://www.freepatentsonline.com/1519081.pdf
Erich in Seattle
http://www.freepatentsonline.com/1519081.pdf
Erich in Seattle