"STRUCTURE AND METAMORPHOSIS OF FROZEN PRECIPITATION
AS OBSERVED WITH LOW TEMPERATURE SCANNING ELECTRON
MICROSCOPY"
During the last 5 years, Wergin and associates developed
the technology to sample and store snow samples at remote field locations
and transport them to their laboratory in Beltsville, MD, where snow crystals
could be observed and photographed with a modified scanning electron microscope.
The microscope, which was equipped with a cold stage that maintains sample
temperatures at about -175 C, allows magnifications to 50,000X. this
unique technique allows, for the first time, high resolution images of
fresh and metamorphosed snow crystals that can be recorded and projected
in 3-dimension.