“By means of a screw in the handle the point of the instrument is moved from side to side, or extended in a straight line;  hence facilitating introduction into the uterine canal, and when introduced, we have but to turn the screw in the handle to bend the distal end of the elevator in the opposite direction, and thereby correct the flexion we wish to rectify.  With respect to inversions of the uterus it is equally serviceable.”  -  Eaton, 1889 Tiemann - p.483.