This record contains one part from an electron beam gun. The object is circular with three protruding metal parts along the edge. There is a hole in the middle of this circular component. There is a movable piece attached to the top of the circular component . This moving piece has two square shaped holes, and one piece of glass set into one of these square holes. There is a copper colored piece screwed to the top of the circular component which acts as a lip for the movable piece.