As one in the series of programmed instruction handbooks, prepared by the U. S. space program, home study material is presented in this volume concerning familiarization and orientation on magnetic particle properties. The subject is presented under the following headings: Magnetism, Producing a Magnetic Field, Magnetizing Currents, Materials and Sensitivity, Magnetic Particle Indications, Inspection Methods, and Demagnetization. High product reliability and quality in metal processing are the main concerns throughout the volume. The material is designed for use with formal courses and written in a scrambled, self-study, self-pacing format including self-test questions. Learners are instructed when to turn the book around and read the upside-down printed pages. "Linear review" frames are provided at various points to help learners in reviewing the preceding material. Beside illustrations for explanation purposes, a self-test answer sheet is included. (CC)