  It was predicted that the spin precession frequency of a stationary gyroscope
shows various anomalies in the strong gravity regime if its orbit shrinks, and
eventually its precession frequency becomes arbitrarily high very close to the
horizon of a rotating black hole. Considering the gravity waves of a flowing
fluid with vortex in a shallow basin, that acts as a rotating analogue black
hole, one can observe the predicted strong gravity effect on the spin
precession in the laboratory. Attaching a thread with the buoyant particles and
anchored it to the bottom of the fluid container with a short length of
miniature chain, one can construct a simple local test gyroscope to measure the
spin precession frequency in the vicinity of the gravity wave analogue black
hole. The thread acts as the axis of the gyroscope. By regulating the orbital
frequency of the test gyroscope, one can also be able to measure the strong
gravity Lense-Thirring effect and geodetic/de-Sitter effect with this
experimental set-up, as the special cases. For example, to measure the
Lense-Thirring effect, the length of the miniature chain can be set to zero, so
that the gyroscope becomes static. One can also measure the geodetic precession
with this system by orbiting the test gyroscope in the so-called Keplerian
frequency around the non-rotating analogue black hole that can be constructed
by making the rotation of the fluid/vortex negligible compared to its radial
velocity.
