all around the mesh of grid, the edge is commonly called rim or JANTE in French,
Attention The markings materialized on the grid, can be different according to the manufacturer (Veco, Gilder, Pyser ,, ….) In the center on some grids you have a mark which makes it possible to be located under the microscope, although the current MET are computer-controlled whose associated software can drive the stage that carries the grid and follow the movement of the grid live. We can also record positions (X Y) of interest that allow us to return at any time.
a graduation (asymmetrical) on this rim as the 1 on this grid, allows to recognize the face and the top of your grid, although if the cup is placed on one side and you observe on another face is not a problem since you look in transmission in an open mesh. the face may be important for other reasons a smooth glossy face and a rough dullness. If you have a cut with a rough surface, it will probably stick better on the rough side of the grid. We prefer, the glossy side to ask the typical films, formvar, carbon or other. ultra-fine cuts made with a diamond can adhere perfectly on this smooth side, brilliant voila how are manufactured in general the grids in copper or nickel by electrochemical process by Electro-Forming