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of Charles Street, St Rollox, Glasgow, maker of patented cast iron pipes
Company established by Daniel Yoolow Stewart
1847 Formation of the partnership of Messrs. Stewart and Bowser
1850 Partnership change. '...the Partnership heretofore subsisting between us the undersigned, David Yoolow Stewart, of Glasgow, in the kingdom of Scotland, William Black, of Wellclose-square, in the county of Middlesex, Thomas Henry, of Mark-lane, in the city of London, David Henry, of the same place, Howard Bowser, of Glasgow aforesaid, John Pullar, of Perth, in the said kingdom of Scotland, and Lawrence Pullar, of the same place, and Alexander Angus Croll, of Tottenham, in the county of Middlesex, trading under the firm of D. Y. Stewart and Company, at Charles-street, Saint Rollox, Glasgow aforesaid, as Ironfounders, v/as dissolved by mutual consent, as upon and from the 6th day of March 1850, so far only as respects the undersigned, Alexander Angus Croll, who retires therefrom; but such business will henceforth be carried on under the like firm by all the above-named parties (other than the said Alexander Angus Croll)...'
1851 Award at the 1851 Great Exhibition. See details at 1851 Great Exhibition: Reports of the Juries: Class VI.
1870 Supplied all of the pipework for the water supply system in Paisley
1881 Supplied 27 miles of pipes for the Vyrnwy Aqueduct
1882 Partnership change. 'In consequence of the death of Mr. David Yoolow Stewart, Ironfounder, Glasgow, on the 25th September, 1882, the Copartnership carried on by him and the subscribers Howard Bowser and William Black Stewart, as Ironfounders and Engineers, Charles-street, St. Rollox, Glasgow, under the firm of D. Y. Stewart and Co., was dissolved as upon that date. The business continues to be carried on by the subscribers Howard Bowser and William Black Stewart on their own account under the same firm of D. Y. Stewart and Co....'
Post-1882 After Mr. Stewart's death, the capacity of the works, in regard both to quantity and efficiency, was greatly increased under Mr. Bowser's supervision
1895 Advert. 
1899 At the time of his death Mr Bowser was maturing a scheme of extensive improvements in the electric power of the works.