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Hathorn, Davey and Co of Sun Foundry, Dewsbury Road, Leeds were makers of stationary steam engines.
c.1872 Abells of Derby set up a Works in Leeds for Henry Davey. Davey's differential pumping engine was such a success that more capital was needed to expand, which was provided by Colonel Hathorn, Davey's lifelong friend.. See Hathorn, Davis and Campbell.
1873 Henry Davey was manager.
1876 Details of their pumping machinery for the Erin Colliery at Westphalia. 
1877 Dissolution of the Partnership between John Fletcher Hathorn, Alfred Davis, Hugh Fletcher Campbell,and Henry Davey, as Engineers and Ironfounders, at the Sun Foundry, Leeds, in the county of York, under the style or firm of Hathorn, Davis, Campbell, and Davey, as and from the 10th of November 1877 so far as regards Hugh Fletcher Campbell.
Exhibited pumping engines at the 1878 Paris Universal Exhibition
1878 Dissolution of the Partnership between John Fletcher Hathorn, Alfred Davis, and. Henry Davey, as Engineers and Ironfounders, at the Sun Foundry, Leeds, in the countyof York, under the style or firm of Hathorn, Davis, and Davey, so far regards Alfred Davis.
1878 The firm was Hathorn, Davey and Co
1881 Direct-Acting "Differential" pumping engine for Nottingham Waterworks (Papplewick Station) for temporary extraction until the new engine house was operational (1884), subsequently moved to Boughton.
1882 Davey differential engine for Bank Hall Colliery
1885 Gold medals for invention of (1) domestic motor; (2) differential gear for pumping engines and improvement in valves for water pressure engines.
1888 Differential Compensating Pumping Engine at Weston-super-Mare. 
1888 Direct-Acting Pump for Wolverhampton Waterworks (Cosford Station)
1889 Direct-acting accumulator pumping engine. 
1889 A number of small safety engines shown at the RASE at Windsor. 
1890 Hydraulic and pneumatic sewage pumps. Details and Illustration in 'The Engineer'. 
1891 Engine for Cosford Pumping Station, Wolverhampton Waterworks, Donington.
1891 Davey differential engine for Clifton Colliery at Burnley.
1894 1,000 hp Davey Pumping Engine for draining mines. Illustration and article in 'The Engineer'. 
1894 Two sewage pumps to Cambridge City Council and these are preserved and can be seen at the Cambridge Museum of Technology
1896 Vertical Rotative Engine for Liverpool Waterworks (Aubery St Station)
1900 Issued catalogue of pumping engines for mines with sections for steam, hydraulic and electric driven types. 
1900 Details of a triple-expansion pumping engine. 
1900 Details of hydraulic power plant for the Miike Mines in Japan. 
1901 Private company.
1910 Vertical triple expansion engine from Newmarket now preserved at Kew Bridge Steam Museum
1914 Engineers. Specialities: steam, electric, hydraulic and belt-driven pumping machinery for water works, mines, sewage. 
1927 Pumping engine for Mill Meece Pumping Station, which has been preserved and can be seen running on steam.
1927 Advert for pumping machinery of all types. 
1934 Hathorn Davey went into liquidation in October 1934.
1936 Business taken over by Sulzer Brothers.
1961 Mechanical and hydraulic engineers. Manufacturing pumping installations for water supply, sewage drainage and similar purposes; boiler feed and and circulating pumps for power stations. 400 employees. 
1980/1 Left the Sun Foundry and moved to the Millshaw area of Leeds.
2016 Company finally wound up by Sulzer Brothers.
A detailed history of the company, 'Hathorn, Davey of Leeds - Manufacturers of Steam Pumping Machinery 1872 - 2016' has been written by Robert W. Vernon and published in 2021.