A note on crystallite size and intrinsic electric strength of polythene

This note describes a continuation of investigations described in an earlier paper.1 Specimens of the type formerly tested contained partly oriented crystalline spherulites of considerable size (up to 5.10¿3 cm diameter), and it was considered advisable to investigate whether this type of structure affected the electric strength. Further measurements have accordingly been made on quenched and unquenched polythene, the former possessing a structure which differs markedly from that of the previous specimens, but no significant difference is found.