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The Ardwick Engineering & Machine Co of Bennett Street, Ardwick, Manchester
1895 Cold sawing machine featured in The Marine Engineer
1898 Makers of small stationary and marine steam engines and gas engines, and 'drilling machines for amateurs' (presumably hand-powered). An item in 'The Engineer' reported that they had completed two triple expansion engines with cylinder bores of 2.25", 3.5" and 5" bore, 5" stroke for colonial users
1898 Producing marine engines of the 'Compact' type for Calcutta, the Falkland Islands, Russia and Finland
1898 It was reported that the firm had recently supplied four compound condensing marine engines, cylinder diameters 5" (HP) and 8½" (LP), stroke 5½". The had also introduced an improved small power gas engine 'in which a tappet arrangement is adopted in place of the usual rotary mechanism' 
1903 Advertising the 'Compact' oil and gas engines in ¼, ½, and 1 bhp sizes (see photo). They would also supply castings, forgings and drawings for making the engines
1903 Slater's Manchester, Salford & Suburban Directory, 1903 (Part 2) identifies Atkinson & Leather as the proprietors of the Ardwick Engineering & Machine Co. Atkinson's home address: 73 South St.
1910 Partnership dissolved between Charles Atkinson and Thomas Picton Leather, Engineers, of Bennett Street Iron Works, Ardwick 
Slater's Manchester, Salford & Suburban Directory, 1911 (Part 1) lists C Atkinson, Engineers, at 12 Bennett Street
The remains of a small vertical gas engine are on display at the Anson Engine Museum (see photos)
12 Bennett Street was on the RHS of the street heading north east from Hyde Road. It is clear from the 1915/1922 O.S. map  that all the visible premises in the row comprising Nos 2 -12 were small terraced houses. This suggests that the works occupied one or more railway arches in the viaduct which cut through the row. This seems to be supported by photographs taken in 1964 and 1972