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Seaward & Capel were makers of steamships, of Poplar.
Founded by John Seaward (1786-1858)
John and Samuel and James Capel gained renown for their introduction of the direct-acting paddle-engine. They fitted warships as well as Thames steamers, and also made swing-bridges and cranes.
c.1835 Naval contracts were given to Seaward and Capel for the first time.
1834–5 the company built a shed along the north side of the wharf, as covered sawpits and a warehouse for castings.
1836 John Seaward introduced a direct-acting paddle engine and this was known as the 'Gorgon' engine. A model is in the London Science Museum
1836 Seaward and Co were manufacturers of steam-packet machinery
1838 Incorporated another wharf into the Canal Iron Works, building a smithy. The main works buildings were extended southwards, remaining in use as a foundry and mill with associated shops, and served by sheer-legs and cranes of up to 20 tons capacity on the wharf.
1838 Insured: John Seaward and Co, the Canal Iron Works, Mill Wall Poplar, founders and engineers
1838 Insured: Samuel Seaward, Canal Iron Works
1842 Samuel Seaward died; John Seward continued the business.
1843 The Penelope steam frigate (Seaward and Co of Poplar).
1859 Messrs. Seaward and Company built an engine to run between London and Leeds, which worked well and ran at a good speed, but from the "oppressive burden of the absurd and disgraceful tolls, it was impossible to carry out the intention with any chance of remuneration to those engaged in the enterprise." The matter remained in abeyance for some time, but was eventually abandoned. 
1860 the Canal Works were taken over by William Jackson and Richard Watkins (see Jackson and Watkins).