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Clarke & Dunham of 69 Mark Lane, and 48 Mark Lane, London.
Licensees of Leuvain's needle lubricator
William Fairbairn described 'an ingenious contrivance' for dynamically balancing millstones made from blocks of French burr, incorrectly naming the firm as 'Clarke & Durham' . Weights were installed at 90 degree intervals in vertical holes in the wheels. The height of each stack of weights was adjustable by a screw, and by this means the wheel could be made to rotate in balance and without wobble. The holes were covered by plates showing the patent date 1859.
1868 Partnership dissolved. '...the.Partnership heretofore existing between Henry Clarke and William Dunham, in the trade or business of Patentees of the Millstone Balance, Factors, and Merchants, and under the style of Clarke and Dunham, at No. 48, Mark-lane, London, is this day dissolved by mutual consent, so far as regards the said Henry Clarke. The said trade or business will in future be carried on by William Dunham alone, at No, 48, Mark-lane, London, under the name or style of Clarke and Dunham,...'