a biographical dictionary of civil engineers aquatint benjamin hick blacksmith boulton and watt carding d slide valve darlington flax flax mill george stephenson holbeck james pickard john blenkinsop john kendrew joseph bramah joy valve gear leeds liverpool machine tool middleton railway mississippi moscow navy board patent rack railway round foundry russia samuel smiles steam engine steam locomotive stockton-on-tees the salamanca trevithick tyneside whickham whitesmith william murdoch