  In 2006 Tajmar et al. reported on the measurements of extreme gravitomagnetic
fields from small Nb rings at cryogenic temperatures that are about 18 orders
of magnitude larger than gravitomagnetic fields obtained from GR (general
relativity). Cifuolini in 2004 and the NASA-Stanford Gravity Probe-B experiment
in 2007 confirmed the Lense-Thirring effect as predicted by GR (gravitomagnetic
fields generated by a rotating massive body, i.e. Earth) within some 10%. In
2007 gravitomagnetic fields generated by a rotating cryogenic lead disk were
measured by Graham et al. Though these measurements were not conclusive (the
accuracy of the laser gyrometer was not sufficient to produce a standard
deviation small enough) their experiment seems to have seen the same phenomenon
reported earlier by Tajmar et al., termed parity violation. This means that
gravitomagnetic fields produced by the cryogenic rotating ring or disk vary
substantially and change sign for clockwise and counter-clockwise directions of
rotation. The experimental situation therefore occurs to be contradictory. On
the one hand GR has been confirmed while at the same time, there seems to be
experimental evidence for the existence of extreme gravitomagnetic fields that
cannot be generated by the movement of large masses. If these experiments can
be confirmed, they give a clear indication for the existence of additional
gravitational fields of non-Newtonian nature. As was shown by the GP-B
experiment, measuring gravitomagnetic fields from GR poses extreme
difficulties. Therefore a novel physical mechanism should exist for the
generation of gravity-like fields, which might also provide the key to
gravitational engineering similar to electromagnetic technology.
