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Insulating Pipes from Vibration and Deformation
Pipes (gas, water and others) carried by bridges, sheathed tunnels or other metal structures commonly rest on stands or are suspended by means of stirrups. In neither case is there adequate insulation from the carrying structure, consequently the pipes are subjected to the influence of vibration, and, still more serious, to be disjointed owing to deformation of the carrying members. To mitigate both these accidents it is suggested that stirrups should he suspended by means of springs, and that in special cases a spiral spring should be interposed between the crown of the pipe and the structural member immediately above it. When pipes are carried in cradles, springs can be inserted in the rests to act as buffers or cushions. (Deutsche Bauzeitung, No. 58.)
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