In the beginning of the sixties the construction of superconducting
lenses started out accompanied by enthusiastic prognostications / Fernandez
Moran (1965), Laberrigue et al (1964)_7. Regarding more or less theoretical
aspects some doubts have arisen in the last years concerning any real
advantages in superconducting electron optic devices J_ Bon jour (1976)_7. I
think, however, one is now able to prove with facts that superconducting
lenses are going to be powerful instruments in electron microscopy. Examples
for the possibilities are given in the micrographs (Fig. 9-13) taken with a
superconducting lens system. Figure 13d, e.g. demonstrates that mercury
atoms arranged hexagonally with a distance of O.36 nm can be clearly
distinguished.