(United Kingdom)A G Calley; (United Kingdom)C F Forster; (United Kingdom)D A Stafford;by ()V.S.Popo (United Kingdom)W.G.Gray; (United Kingdom)G.F.Pinder; (United Kingdom)C.A.Brebbia;by (United States (United Kingdom)L.Urdang; (United Kingdom)N.Laroche; (United Kingdom)G.E.Christ; (United Kingdom)D.Willcocks; (United Kingdom)J.Rutter; (United Kingdom)C.Morris; (United Kingdom)A.P.Cowie; (United Kingdom)R.Mackin; (United States)J.Stein;