The following discussion, here printed in summary, took place on Mr. E. S. Calvert's paper ‘Visual Judgments in Motion’, which was presented at an Ordinary Meeting of the Institute on 21 May. The chairman was Air Chief Marshal the Hon. Sir Ralph Cochrane, G.B.E., K.C.B., A.F.C. The paper was printed in the last number of the Journal (July).

The Chairman: Am I right in thinking that I.C.A.O. have accepted the Crossbar system of lighting? Is it the normal pattern in international airports?