except that a roller bearing 24 is used as an alternative to the plain bearing 13 shown in fig1 if a movement of bearing 13 or roller bearing 24 occurs which movement is the result of misalignment of the rotor journal with respect to the axis of rotation of the rotor an additional apparent unbalance would be transmitted to dynamometer 5 caused by the rotation of the journal if there were no spring support of the bearing as a result of the inventive spring arrangement 1 the bearing can adapt to the mechanical inaccuracies around the vertical axis z of the bearing support structure and around the transverse axis y of the bearing support structure 10 so that practically no falsifying additional forces or additional moments are transmitted to dynamometer 5 the weight of bearing 13 is transmitted by the tapered rollers 2 to the foundation and the proportional weight of the rotor associated with the bearing support structure is also transmitted to the foundation skirts 4 are provided to stiffen the base plate 7 these skirts are preferably welded to the base plate 7 and also serve to protect the spring arrangement 1 together with the tapered rollers 2 and rods 3 connected thereto the tapered rollers 2 each have a horizontal axis of rotation and these rollers are positioned to the right and left of the vertical axis z the rollers z accommodate the movement around the vertical axis and transfer the weight of the bearing and the proportional weight of the rotor to the foundation 9 when a hydrostatic bearing 30 of the type shown in fig4 is used instead of the tapered roller bearing the skirts 4.