by (United Kingdom)W.N.Sproson;by (United States)D.Ingram; by (United Kingdom)R.E.Parker;by (United States)D.F.Falk; by (United Kingdom)R.Holmes;by (United States)D.Monaghan; by (United Kingdom)W.E.Parry;by (United States)A.O.Barut; by (United Kingdom)W.R.Ashby;by (United States)F.Csaki; by (United Kingdom)W.R.Ebbitt;by (United States)J.Flynn; by (United Kingdom)W.M.Smyth;by (United States)J.G.Varnado; by (United Kingdom)E.L.Epstein;by (United States)W.N.Francis; by (United Kingdom)L.M.Delves;by (United States)D.W.Kahn; by (United Kingdom)W.Empson;by (United States)F.Rissover;