  The principle of operation and the construction are described of the
gravitational gamma spectrometer to study the gamma resonance of the long-lived
isomer $^{103m}$Rh. This is a table-top device which measures the form of gamma
resonance by the dependence of counting rate of gamma-rays in collimated beams
on the angle of their inclination with respect of the horizontal plane. Methods
of fabrication of gamma-sources for this device are considered.
