sponsored jointly by The Institute of Physics and the Physical Society. published by the Institute of Physics and the Physical Society. The Institute of Physics and the Physical Society. Institute of Physics and the Physical Society. sponsored by the Institute of Physics & the Physical Society, Electronics Group. Institute of Physics and the Physics and the Physical Society. sponsored by the Institute of Electrical and Electronics Engineers. sponsored by the Institute of Electrical and Electronic Engineers. sponsored jointly by the American Society for Testing and Materials and U.S. Navy. sponsored by the American Mathematical Society.