The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 330
the frustrum of the cone bevelled out in the rock ; but long lengths,when driven, if the deviation is small, are like the trifling inaccuracyo( an angle, which, if produced, are a long way out at the far end ; itis, therefore, advisable to keep the lengths short, and in the annexeddiagram are five.…
Architecture · Civil engineering · Science
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