Trench Type Subaqueous Tunnels - Design and Construction. Discussion on the paper by John O. Bickel

A Code of Practice for timber has to take into account considerations ranging from forest economy to the changing effects of industrialization in the building and timber industries. In so far as it succeeds in its task it becomes an instrument of policy for the utilization of natural and industrial resources and in particular for improving communications between research and design. Rapid changes in industrial techniques demand a flexibility in codification which places greater emphasis on the importance of prototype testing and on a better understanding of the significance of behaviour characteristics requiring some re-alignment of research and design concepts. Phillip O. Reece

This paper deals with the design of high flats where the height/base width ratio is such that limitation of deflection becomes the criterion in design. It discusses first of all the estimation of wind forces and a comparison with American practice. Both portal and cantilever methods of design are considered and the results of the cantilever method are compared with the results obtained from an exact computer analysis. H. McClusky

This month's letters cover legislation for design checks, embodied carbon of modular construction approaches, and assessment of masonry buildings for earthquake resilience in New Zealand.