Author: Murray, N W
First published: N/A
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Murray, N W
This paper discusses in summary form the forthcoming changes in National Insurance as particularly affecting the self-employed, but including those with other occupations as well. It is written to provide a quick resume of the position as it is known, which can be assimilated at one reading. It aims to provide an awareness so that those affected can see what further action is required and what further areas need to be studied. It must be emphasized, however, that it is not prepared as a substitute for official publications, nor for the Statutes.
Shells constructed by lifting a flat square lattice into a doubly curved shape are a recent form of construction. Such a shell of four times greater span than any previous examples had to be completed in 18 months for an exhibition. This paper describes the engineering design. It attempts to show how the loads were defined, how the structure was modelled and tested both physically and mathematically, and how these models were used to determine the construction details. The design process had to be evolved to derive sufficient understanding so that the decisions could be made by the critical dates.
E. Happold and W.I. Liddell
When specimens of wood with seemingly similar characteristics are tested, the strength results usually show high variability. This is attributed to two major sources:
(a) Primary sources or the material factors.
(b) Secondary sources or the human factors.
Daniel N. Nwokoye