“…Kuhlmann-Wilsdorf, Merwe, and Wilsdorf (39,42) have pro posed from their observations of fine slip at very low strains in copper, aluminum, and silver that the slip bands develop The size of the precipitate particles of cobalt was deter mined by means of a magnetic technique described by Becker (5) and used by several others (6)(7)(8)(9)16,17).…”