The purpose of this volume is to provide a comprehensive guide to the safe and effective employment of tugs doing ship work The text is primarily directed to the attention of pilots, docking masters, tug captains and ships' officers who would have a professional interest in the subject. The material will also be of interest to those who may not be immediately involved in the mechanics of shiphandlig, but who have an affiliate interest in the process. The attention of the pleasure boatman or landsman with an inquiring mind is also welcomed.