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Sir,-I read with considerable interest the article in your issue of December, 1923, on Present Methods of Teaching, which was contributed by Mr. W. G. Sheppard in relation to a paper by Mr. H. H. Clapham, which was published in your November issue.
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