A Dewar apparatus includes a focal plane array component coupled to an FPA carrier, and a cold bridge coupled to the FPA carrier. By combining multiple lightweight tracking processes, object tracking can be robust, use a limited amount of power, and enable a computing device to respond to input corresponding to the motion of the object in real time. The method continues by issuing a plurality of commit commands to the plurality of DS storage units when a write threshold number of the received write acknowledgements have been received. The device may include a sound attenuator that reduces noise upon impact of the ball with either end of the conduit. Also set forth are specific embodiments of pivotable rotary geared actuators as well as linear ball screw type actuators embodying the couplinguncoupling mechanisms of this invention.