Column-mounted Helmholtz Coils are
readily adapted to SEM columns but
impractical for TEMs.

Floor-mounted Helmholtz Coils may
be used for both SEMs and TEMs.

Helmholtz Coils may be mounted
on a TMC leg frame.

Wall-mounted coils are a practical alternative to column and floor-mounted coils for
TEMS and SEMs installed near the center of a room.