Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
Amazingly there's no vacuum pump as the distant from electron gun to
sample holder is <1mm. The resolution is not great compared to
modern machines.
^^^^^^^^^Dr. Reisner said that a unique advantage in time-saving and
convenience is afforded by an engineering advance which for the first
time permits insertion of specimens into the evacuated column, and
^^^^^^their removal, without breaking the vacuum. In addition, he said,
^^^^^^^photographic plates may be changed without admitting more than a
small amount of air to the column. As a result, pumping time between
plates is reduced to only 90 seconds, which is just about enough time
for the photographic development normally carried out between
exposures.