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Park Ironworks (William Coulthard and Sons), Grimshaw Park, Blackburn
1863 Designed a new type of valves for furnace blowing engines, based on india rubber balls.
1872 Advert: 'Park Iron Works, Blackburn, Lancashire.— In Chancery. Coulthard v. Dewhurst.
To Ironfounders, Engineers, Quarry masters, Machine Brokers, and Others.
To be Sold by Auction, pursuant to an order of the High Court of Chancery, made in the above cause, with the approbation of the Judge whose Court the said cause is attached, by Messrs. SALISBURY and HAMER (the persons appointed by Sir James Bacon to sell the same), on Thursday, 29th day of April, 1872, commencing at one o'clock in the afternoon prompt, at the Park Iron Works, situate at Grimshaw-park, Blackburn, in the county of Lancaster,
THE valuable FOUNDRY PLANT, Cranes, Cupolas, Shafting, Piping, Gearing, &c., comprising valuable 5, 6, and 10 ton foundry cranes, with double and single crab actions, traversing motions, gearing and fittings, as set up; one 10 and three 5-ton double and treble geared travelling cranes, with iron stays, travelling motions, cross beams and fittings; 10 tons wrought-iron cupolas with stage; brass melting furnace; seven brick-built smiths’ hearths; large quantity of wrought-iron shafting, with drums, pulleys, wheels, fixtures, and fittings; gas and water meters, steam and gas piping, tramway metals, turntables, fitting benches, pattern shelves, office and drawing desks, counters, bolt boxes, and other effects. Descriptive catalogues may be had on application....'