'Key plate of the engraving of the Conference of Engineers...', by John Lucas, 1858
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'Key plate of the engraving of the Conference of Engineers at the Menai Straits preparatory to floating one of the tubes of the Britannia Bridge identifying frgures present'. (Engraving painted by John Lucas, engraved by James Scott and Published by Henry Graves and Company, Printsellers to the Queen, 6 Pall Mall, London. 25 january 1858.
