Such care may be very troublesome at first, but it will result in great saving of expense.
In addition to the authorities named there are the rules and "reformed" spellings adopted by the American Philological Association and published by the United States Government.

These are followed fully in some offices, partly in others, and in many not at all.

This is a question of the office style and the author's wish.

If copy is clear and spelled according to any authority, it is the compositor's duty to follow it.

If it is misspelled or illegible he is to correct it according to the office style unless otherwise directed by the author in writing.