The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 111
e reverse way preventing the blocks from rising, as the short sidesof the hexagons at the surface coincide with the central parts of the longsides of the adjoining bexagonj; small triangular interstices are left whichmay he filled up with grouting, nflbrding by this means a footing for horses.The… … Fig. 2.
Architecture · Civil engineering · Science
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