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Engineers and sugar machinery manufacturers, and makers of stationary engines, and of cloth finishing machines, of London Road Iron Works, Glasgow.
The name of the firm seems also to be written as Duncan, Stewart and Co, and also D. Stewart and Co, but these are all thought to be the same firm.
1854/64 Company founded by Duncan Stewart
1874 Patent to Duncan Stewart of the firm Duncan Stewart and Co, of Glasgow, in relation to clips or holders for cloth stretching or finishing machines
1889 See 1889 Shipbuilding Statistics for detail of the marine engines produced
1893 Supplied engines in conjunction with Ferranti for electric lighting in Barcelona
1901 800 ihp compound vertical electric-traction engines for Glasgow Corporation and for Western Australia 
1907 Messrs. D. Stewart and Co. of Glasgow showed a 5-ton machine on the Stewart-Thornycroft system at the Commercial Motor Show
1909 Showed a 40 hp compound steam tractor
1910 Supplied complete sugar processing plant to Ciego de Aula, Cuba
1911 Private company.
1919 Advert for hydraulic machinery for steelworks plant.
1927 Advert for sugar machinery.
1954 Davy United tookover Duncan Stewart
1961 Sugar machinery specialists.