Sir,-It is noted that the author of the article on “Recent Progress in Bridge Design in Tanganyika Territory" admits the accuracy of the deductions concerning the stresses in the structure referred to in my letter published in the September issue of your Journal. I have read again with care the original article, and can see no reference whatsoever to the decking slab being cast some considerable time after the webs of the beams. If this procedure to be followed it is hard to understand the reference to a factor of the safety in the Rolled Steel Joists of 3 due to dead load, if the bridge is to be constructed in such a fashion that this loading cannot come on the naked steel joists. Whether the design is such that the slab may be considered adequately bonded to the web of the tee beam is open to serious question, and most designers in structures of this type place the top flange of the R.S.J. just under the top surface of the slab. (Water & Water Engineering, Midsummer, 1932, page 260, etc.) The use of comparatively heavy and unwieldy R.S.J.'S under the conditions visualised in the paper would hardly appear to be justified as a normally designed reinforced concrete beam would contain much less steel and would only necessitate vertical strutting. Such reinforced concrete beam bridges for similar spans have been constructed in numerous cases during the past 20 years by the South African P.W.D. utilising native labour.
土壤力学或换句话说，土壤动作科学现在正在从土木工程期刊上获得大量的宣传。实际上，几乎没有一周的过去，而没有提及美国和大陆渊源的主题。从所给出的帐户来看，毫无疑问，在某些国家，这个问题当然已成为所有与基金会安全相关的人中的领先主题考虑实用性。去年6月，哈佛大学第一次国际土壤力学和基金会工程会议的就职典礼进一步表现出了对该主题的发展和进步的普遍兴趣。在课程报告中是来自世界各地的，这些活动在某些方面表现出了非凡的活动，以使新科学置于实际的基础上。M.J.C.麦卡锡
在1900年之前，在美利坚合众国竖立了许多摩天大楼，钢制建筑通常是通常的。铸铁底座和柱子正在使用，而三十层的建筑物被认为很高。S. Bylander
我一直坚信成员对机构，协会或社会甚至俱乐部的责任并没有以准时的订阅方式开始和结束。他从该机构获得的好处在很大程度上是由他作为成员提供给机构的服务所确定的。以这种精神，我已经接受了办公室，依靠您的帮助，甚至更多地忍受了您的忍耐。J. Dunlop Anderson