However David Tanner also did not stay long, giving up the works in 1786, the year of Bacon's death.
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Isaac became a foundryman in Bristol with involvement in the south Wales Dowlais Ironworks and Cyfarthfa Ironworks, and starting the Plymouth Ironworks with John Guest.
In 1786, Richard Crawshay and partners took over the lease of the Cyfarthfa Ironworks, and soon engaged the canal engineer Thomas Dadford to survey a route for a canal to Cardiff.
William Crawshay II (1788–1867), his son, owner of Cyfarthfa Ironworks in Merthyr Tydfil