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Mr. S. VAUGHAN (Member of Council), proposing a vote of thanks to Mr. Bullen, said the paper was exceptionally interesting because it presented some facts and figures (however controversial these might be) which enabled a comparison to be made between various constructional solutions to a given pre-determined problem.
Before the inception of the British Grid System for electricity supply, the overhead electric transmission lines then existing were nearly all of low and medium voltage. The 132 kV. Primary Lines of the British Grid therefore set a new standard in this country, not only of the voltage of the lines and the power they were to transmit, but also as regards the size of conductors, tower heights, spans between towers, and degree of reliability demanded. These factors had their influence on the design of the towers, as the loads to be sustained, both under normal and abnormal (broken conductor)
conditions, were much greater than was usual in this country previously.
H.W.B. Gardiner and W.H. Gomm
Mr J. M. Mawditt (M): The paper is to be commended for simplifying the design procedure associated with the use of the material stress -strain curves as required by clause 22.214.171.124. of CP 110.