“…The viscosity and its variation with temperature were experimentally determined for all the commonly used lubricants, but for the pressure-viscosity relationship many different results were obtained. Some of these results were presented by Roelands [32], Rein et al [33], Jones et al [34], Wellauer and Holloway [35], Brooks and Hopkins [36], Cameron [37], Bair and Winer [38], and Napel et al [25].…”