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AT the General Meeting of the Institution, held on Thursday, the 21st February, the following paper was read by DR. E. H. SALMON:-
I. That Euler’s limiting load merely implies passage from one type of stable equilibrium to another, and does not involve the failure of the column. (Quoted in "Popular Fallacies Explained and Corrected,” by A.S.E. Ackermann, BSc. Engineering), 3rd edition, p. 884, in the inverse form, from a review by L.N.G.F. in "Nature,” June 24, 1920.)
AMONGST the interesting developments expected in the Provence of Mozambique (Portuguese
East Africa) is the completion of it works to produce Portland Cement at Lourenço, Marques. At the present time a £9,O00,000 loan to the Provence is being negotiated and irrigation and other works will benefit. To find cement on the site as it were is therefore a matter of interest. The factory itself is interesting in that of its kind it is probably the last word in up-to-date manufacture, and a high class cement is expected. The construction stage has now terminated and production is likely to commence this month.
South African Correspondent
ESTRACTS from Report of American Concrete Institute’s Committee on Treatment of Concrete Surfaces :-
When reinforcing steel in exterior members is not back at least one full inch from the outside face of the concrete, moisture works its way in, causing it to rust. Eventually, this rusting if continued will spall off the concrete and cause an unsightly appearance, and may even in severe cases affect the strength of structure. Good design should never call for such sizes of hoops, spirals, stirrups, &C., as will necessitate steel within one inch of the surface, but sometimes due to careless placing the steel will be at or near the surface.