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SIR,-The letter in the February issue by Mr. P. E. Robertson, A.M.Inst.C.E., criticises
my paper which was read in November last, and in particular takes exception to:-
(a) That they possess physical properties identical with those of the base metal, and
(b) That, presumably as a consequence, the elongation developed is equal to the minimum usually specified for mild steel.
The question of determining camber allowances, discussed in general terms would not convey much real information, as each different type of bridge requires special consideration. This applies particularly to the two-hinged spandrel-braced steel arch
which introduces problems peculiar to itself. Consequently this type is taken as an example and considered in det'ail, in the hope that in this way the various principles and processes will be clearly demonstrated, so that suitably modified they may be of use when considering similar complex structures.
In his paper The Handling and Storing of Grain with special reference to Canadian
Methods, read at the Institution of Mechanical Engineers, London, on January 27th last,
Mr. H. H. Broughton, M.I.Mech.E., emphasised he importance of grain silos by reminding us that the wheat of which the bread is made comes from the ends of the earth into this
country at the rate of about 120,000 tons per week, and that, if the machinery responsible for such movement had to fail for any cause for a time reckoned in weeks, famine would inevitably result in this country because Britain has safe storage accommodation for only a small fraction of the wheat she consumes.