Experimental Conditions on a Pointed Filament

Abstract

An experimental method producing and usingthe pointed filaments is explained. The pointed filament is formed by the Sakaki-Mollenstedt's method, but a few notice about the electrolytic etching method and a new method adjusting the Webnelt potential will confirm the successful experiments of pointed filaments. In addition it is reported, that the pointed filament is practically very useful in the electron micro cope, which has no condensor lens.