System-Built Flats on a Deep Buried Quarry

As is customary at the first Ordinary Meeting of the New Year, the meeting of the Institution at 6 o’clock on Thursday 8 January 1970 will take the form of an open discussion. This year’s theme is the economic consequences of substantial claims-a subject of importance to all engineers and indeed to all in the construction industry. All members are invited to bring to the meeting, colleagues from the contracting industry from whom contributions to the discussion will be most welcome.

Some cases where incorrect design of beams supporting two-way slabs may result from the use of only the triangular and trapezoidal load distributions which follow the shape of the segments of the panel collapse mechanisms are described and discussed. R. Park

Professor Arthur Bolton, Dr. I.D. Armstrong and Mr. J.F. Doyle: ‘Referring to the derivation of S we feel that the expression has an error resulting from a simple oversight.'