A wind turbine for mounting on an existing industrial chimney (1), tower or the like, includes two vertically aligned blades (3) mounted on rotor arms (2) for rotation about the longitudinal axis of the chimney, tower or the like. The rotor arms are supported from an annular structure (8) secured to...http://www.google.ca/patents/US5419683?utm_source=gb-gplus-sharePatent US5419683 - Wind turbine
