Magnetostatic Prism for Adjusting of Electron Microscope

摘要

A magnetostatic prism is proposed for adjusting an electron microscope. It contains a revolving permanent magnet, creating a magnetic field, perpendicular to the optical axis of the microscope, and is distinguished by simplicity of design. It is provided with a screen moving along the axis, the screen being designed in the form of a cylinder, the geometrical axis of which is superimposed on the optical axis of the microscope, while the shifting of the screen and the turning of the magnet is accomplished by one general drive, or by two independent ones. (Author)