The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 381
Fig. 2. then in a state to have the hole made in the centre for the recep-tion of the boss or nave, and for this purpose is placed in anotherdie or block, only differing from the one described in having a holein the centre, coinciding with the hole to be made. A descendingdie or cutter then forms…
Architecture · Civil engineering · Science
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