b retain positive engagement with the perimeter rim 24 since the turnbuckle 64 tends to clamp the wheel members 62 a and 62 b into engagement with the perimeter rim 24 continuous rotary movement will be imparted from the perimeter rim 24 to the wheel members 62 a and 62 b and the rotary motions from the wheel members will be transmitted through the drive shafts 60 a and 60 b reduction gears 58 a and 58 b to the generators 46 a and 46 b fig4 shows another form of generator assembly 72 which includes generators 76 a and 76 b that are mounted by horizontal support arms 74 a and 74 b respectively and the support arms are pivotally mounted to the upright support shaft 77 that is supported in turn by the platform 44 the reduction gears 78 a and 78 b connect the generators 76 a and 76 b through the drive shafts 80 a and 80 b to the wheel members 82 a and 82 b that engage the perimeter rim 24 the turnbuckle 84 is connected to the reduction gears 78 a and 78 b drawing the generators 76 a and 76 b reduction gears 78 a and 78 b and the wheel members 82 a and 82 b together so that the wheel members 82 a and 82 b make positive engagement with the perimeter rim 24 of the turbine wheel 22 as shown in fig5 which is a top view taken along lines 5 5 of fig4 the horizontal support arms 74 a and 74 b are pivotally connected to the upright support.