The principles of pre-stressed concrete are assumed to be known. Only a few and sketchy descriptions have so far been published with regard to pre-stressing in annular cross sections, such as pressure pipes*, pressure ducts, tunnels and tanks. Dr. K.W. Mautner
Mr. John Thomson writes: “The Scottish Branch suffered a serious loss in the sudden death on the 14th January of Mr. John Wright, Manager and Director of the Colville Construction Company.