11
The total weight of the nineteen specimens
was 375 t 10 grammes.
At first sight the hailstones looked spher-
ical in shape but in fact most were slightly
elliptical in profile, while a few were hemi-
spheres with flat or slightly hollowed bases.
The rounded surface of each hailstone was
covered with small 'warts' of clear ice,
5 mm to 7 mm across, and standing 1 mm or
2 mm high. The flat, or hollowed, surface
of the hemispherical hailstones showed
concentric rings of alternately clear and
opaque ice.
Two specimens were cut in half, the cut
surface disclosing that the hailstone was
made up of concentric shells of ice. In one