Abstract: A turbine in the form of an endless "Venetian blind" set of arcuate turbine blades mounted to extend between a pair of endless chains that are entrained over sets of sprockets so that two flights of the blades travel in opposite directions in closely spaced parallel planes. Shafts connect sprockets of the sets to maintain the blades parallel and to deliver to an alternator the torque applied to the sprockets by the reaction of the blades to a fluid passing therethrough.