line, andif coming the reverse wayalong the diagonal line, it willpass along the diagonal switchd, and enter the line by thesupplementary bars r d. The improved Switches re-presented in page 52, in thelast Number, have been atwork upon the London andGreenwich Railway for morethan twelve months;… … W. J. CURTIS. LEVELLING. In the published account of the Trigonometrical Survey of Great Britain, itis recorded, that the height of the top of the parapet of the north turret of thekeep of Dover Castle was found, by levelling, by Lieutenant Hay, of the RoyalEngineers, to be 465.8 feet above low…
Civil engineering · Architecture
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