 The cylinder is mounted perpendicular to the canister and supported by ball bearings housed in the upper and lower bulkheads.The rotational axis of the centrifuge is formed by shafts centrally located in the vertical plane at right angles to the cylinder, held in place by the ball bearings.Thin, shallow-domed end caps are bolted to each end of the centrifuge with intervening rubber gaskets to prevent leakage.