Patent Drawing of Engine - Coanda 1911 patent - . Public domain image

Sketch of Henri Coanda's turbine-style propeller that he filed for patent in 1911. This sketch is taken from the US patent granted in 1914. An identical sketch was filed in the UK May 26, 1911.
http://v3.espacenet.com/publicationDetails/originalDocument?CC=GB&NR=191112740A&KC=A&FT=D&date=19120118&DB=EPODOC&locale=en_gb