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1828 Partnership change. '... the Partnership heretofore carried on by Hiram Craven, Samuel Whitaker, deceased, and Joseph Nowell, in the business of Builders and Contactors for Public Works, at Keighley, Bingley, and Dewsbury in the County of York, was dissolved by the death of the said Samuel Whitaker, on the 16th day of June 1821...'
See here for information about the company, with particular reference to their work on the Union Canal's Avon Aqueduct and Slateford Aqueduct on the Union Canal. Note: This source states that the castings for the iron troughs of those aqueducts were supplied by Mr. Anderson's Leith Walk Foundry.