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Dear Sir, I am not altogether surprised to find what appear to be misprints in the calculations given in Fig. 4, as similar misprints were tound in the published calculations for an even larger structure, the Sydney Harbour Bridge, but too late to bring the matter up at the time. In the present paper there appear to be three points in Fig. 4 which require elucidation.
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
We apologise to Mr. L. Edwards, for publishing an incorrect drawing on p. 288 of our July issue.The corrected version appears below:-