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The movements produced at the ground surface by underground coal mining are described and the ways in which these produce forces on structures sited on and within the soil are considered. The forces are shown to be related to the deformation properties of both soil and structure. The available information on damaging movements is summarised. Examples are given of a variety of structures which have been successfully erected in areas of mining subsidence. These indicate that there is no longer need to sterilise sites which overlie coal measures. J. D. Geddes and D. W. Cooper
The paper describes the remedial measures taken to stabilize a large blast-furnace foundation which started to tilt during construction. Nyal E. Wilson
The first Presidential Tour took place in 1950, when Mr. Leslie Turner, accompanied by the then Secretary, Major Maitland, visited the South African Branch Headquarters in Johannesburg and the Sections of that Branch in Cape Town and Durban. This visit was at the invitation of the Branch, which by then had been established fourteen years. That the visit was a success is evident by the invitation from the Branch that a second Presidential visit be made. The invitation was accepted and in 1957 Mr. and Mrs. J. Guthrie Brown visited Rhodesia, Kenya and the Union of South Africa. Lt.-Colonel G. W. Kirkland