This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
 

=================================================================================

As shown in Figure 2704, electromagnetic lenses consist of windings of wire through which the electric current is applied. These configurations create a strong magnetic field where the incident electron beam must pass.

Figure 2704. Schematic illustration of electrons passing through electromagnetic lenses.

The coil of wire that forms the lenses in EMs is shielded from external magnetic fields and cooled by refrigerated water.