Abstract: Illustrative embodiments of the invention are directed to a technique for raising and lowering large tainter gates. Typically, two groups of lifting apertures are formed in the gate. A lifting mechanism, resiliently mounted on the tainter gate pier, inserts a movable pin into an aperture in one of the two groups and draws the gate upwardly. A stationary pin on the lifting mechanism then is inserted into an aperture in the other of the two groups to absorb the gate load while the movable pin is withdrawn and moved to a new aperture in order to continue the step-wise lifting process.To lower a gate, an essentially reverse procedure is followed.

Abstract: Hydraulic exerciser comprising a hydraulic control circuit, a single acting positive displacement pump, and an exercise machine designed using the control circuit and pump. With the hydraulic control circuit up to four modes and one combination of modes of exercising are possible; namely isometric, isodynamic, isokinetic, warmup and the combination of isodynamic and isokinetic. In addition the control circuit has a gage for registering the resistive force for all modes or combination of modes of exercising.