The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 410
nd also the chairs to theblocks or sleepers, in place of solid keys of iron v,i wood as heretofore em-ployed, and which hollow metal keys are applicable to other engineering pur-poses. The mode of applying these hollow metal keys is precisely the same as thoseheretofore in use, as will be seen by… … is also shown in section and marked a, the same being applied to fasten therail in the ordinary manner, viz. by driving the key between the rail and the
Architecture · Civil engineering · Science
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