Around 1860 he joined two other Johnson's workers, Duncan McKechnie and Charles Wigg, in setting up the Old Quay Works in Runcorn to make soap and to extract copper by the Henderson wet process.
[3] He left the Old Quay Works to set up his own business, Matheison and Company in Widnes, Lancashire in 1870.
[2] Neil's eldest son, Douglas Dugald (1861–86), an assistant manager at the works, was killed after being struck by a falling derrick.
[5] In 1892 Mathieson obtained a charter in Saltville, Virginia to open an alkali plant, buying out the Holston Salt and Plaster Company.
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