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The Chairman opened the discussion by bringing in a point not emphasized in the paper-that so much largescale prefabricated building using big units had become possible, in his opinion, because of the remarkable development in crane building in the last 20 years. As the author had said in his introduction, industrialized building was nothing very new. In the early 1930s a lot of prefabricated buildings had been designed, but the cranes available were so limited that advantage could not be taken of large units.
Mr. M. E. Richards writes:-
‘The author states in this paper that this method of analysis is not taught in Britain. I should like to point out that numerical methods of volume integration are
now being taught at Korthampton College of Advanced Technology, London to civil engineering students.'
This paper sets out to describe two railway bridges which have recently been reconstructed with composite steel and concrete superstructures. Brief details are given of the history of the old structures now replaced, together with alternative schemes which were considered in the design stage. Methods of construction whilst maintaining rail traffic are discussed and general conclusions regarding the use of composite construction for railway bridges are drawn from the experience of these two cases.