Complex sentence: Path, pg.5 An electromagnet inside the inner cylinder is used to set up an initial field; the field is similar to the one from a bar magnet, running vertically down the center of the inner cylinder and up again outside of the apparatus.
Split into simpler sentences: Path, pg.5 An electromagnet inside the inner cylinder is used to set up an initial field. The field is similar to the one from a bar magnet, running vertically down the center of the inner cylinder and up the outside of the apparatus.