The Effect of the Coarse Aggregate and Other Factors on the Properties of Concrete. Discussion on Pa

Sir,-In Mr. Bridges’ Paper on “Reinforced Concrete for Colliery Surface Plart,” published in your April issue he states “There are many difficulties which make piling expensive and very often impracticable, such as: obstruction by overhead wires and pipe lines to free movement of the piling frame; the necessity for keeping open certain wagon roads for coal wagons; and vibration and consequent disturbance of existing structures.”

IN foundation work the problems involved are, the carrying capacity of the ground, the difficulties of reaching the chosen depths presented by the geological formations, possible disturbance by future work, and protection of adjacent shuctures during construction. H.J.B. Harding

THIS year it is a member of the Yorkshire Branch who has been elected President of the Institution. Lieut.-Colonel Charles Horace Fox, O.B.E., B.Sc., F.S.I., was born at Halifax on the 1st August, 1892, and was educated at Heath Grammar School, Halifax, and Denstone College,Staffordshire. He graduated at London University,taking the degree of B.Sc. (Engineering)with Honours in 1912,and in the same year he distinguished himself as First Prize Medallist in Structural Engineering at the City and Guilds of London Institute.