Author: Scott, Alex
First published: N/A
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Sir Courtauld Thomson, chairman of the Limmer and Trinidad Lake Asphalt Company, in his speech at the annual general meeting in March, referred to the attention the company’s staff was paying to the problem of vibration, and the writers, who have worked in collaboration with the company’s staff, are now able to reproduce some results of experiments recently carried out. W.P. Digby and R.B. Fairthorne
Statistics relating to the Portland cement industry in 1928, compiled by the United States Bureau of Mines, Department of Commerce, from the final returns of the producers for the year, which are, however, still subject to revision, confirm the estimates published by the Bureau of Mines early in January. Production of Portland cement in 1928--176,195,488 barrels-was the largest quantity manufactured thus far in any year, exceeding that in 1927, the next highest year in production, by 2 per cent.
The preliminary report by Mott, Hay and Anderson, consulting engineers, of Westminster, to the Ministry of Transport regarding a proposed road bridge over the Forth at Queensferry has been sent to the local authorities for consideration. The report recommends that the bridge be constructed about a mile dwnstream from the railway bridge, the cost being estimated at £5,570,000 or £6,110,000, according to the route selected for the north approach. A bridge of the suspension type and having a main span of 2,400 ft. with a minimum clearance of 150 ft.-the same as the Forth Bridge-is recommended. The report states thathe present railway bridge was completed in 1889 and was located at the narrowest part of the river, advantage being taken of the rocky island of Inch-Garvie for the site of one of the main piers. It therefore occupies the best position in this stretch of the river. The bridge consists of a main span of 2,400 ft., with a minimum clearance above H.W.O.S.T. of 150 ft. This clearance is the same as that of the Forth Bridge, but while in the case of that bridge the clearance rapidly diminishes under the cantilevers, in the proposed bridge the clearance is maintained under the whole span. The side spans are each 1,040 ft. with clearance above H.W.O.S.T., diminishing from about 150 ft.