An experimental study is made of natural convection oscillations in ga
llium melts enclosed by right circular cylinders with differentially h
eated end walls. Cases heated from below are examined for angles of in
clination (phi) ranging from 0 deg (vertical) to 75 deg with aspect ra
tios Ar (height/diameter) of 2, 3, and 4. Temperature measurements are
made along the circumference of the cylinder to detect the oscillatio
ns, from which the oscillatory flow structures are inferred. The criti
cal Rayleigh numbers and oscillation frequencies are determined. For A
r = 3 and phi = 0 deg, 30 deg the supercritical flow structures are di
scussed in detail.