Dartford and Thameside manufacturing history

 Dartford in the well-watered, sheltered valleys of the Darent and Cray invited occupation, certainly by the Romans and successive invaders. Over the centuries trades emerged and prospered. One of particular note was the making of paper from rags. John Spilman was granted a monopoly for the collection of rags for paper making. A number of paper mills followed including the Phoenix Mill of TH Saunders noted for the quality of its early machine made paper.

Armament production came to Dartford in the mid eighteenth century in the shape of a gun powder factory. This was succeeded by Vickers, Son and Maxim in the nineteenth century in Powder Mill Lane with an ammunition factory.

In 1889, Burroughs Wellcome took over a former mill for pharmaceutical manufacture and in 1914 built a new factory which was added to over the years reaching some 65 acres and over a million square feet of building. They had 2,800 employees in 1979.

A significant if lesser known manufacturer was John Hall a blacksmith who arrived in Dartford in 1785. By the time of his death in 1836 he had a iron works in Dartford, a gunpowder works in Faversham, a paper mill in Horton Kirby and a flour mill at Chislehurst. One of his apprentices was Bryan Donkin who with Hall built a works in Bermondsey to make tin cans for preserving food. I wrote of this in How Britain Shaped the Manufacturing World. The Hall iron works supplied many local industries: gas works, zinc mills, paper mills and cement works. Of greatest importance was their work on refrigeration. It was said that in the Second World War 37% of the nations storage capacity was cooled by Hall's machines.

In 1886 Halls had installed their first cold air cooling machine on a large cargo ship carrying perishable foodstuffs. At that time Britain was the world's leading importer of food from Australia, South America and elsewhere and so refrigeration was essential. Cold air was better than previous methods but a better solution was needed. In 1889 Halls added carbon dioxide in a two stage compressor. To achieve yet colder temperatures, Ammonia was used and a plant was installed in Grimsby to make ice for the trawler fleet. In 1959, the company merged with Thermotank of Glasgow which made patented cooling and ventilation devices. The merged company bought Vent-Axia of Crawley in 1959 and was itself bought by APV in 1976. It is now part of the Japanese Daikin Group and continues to manufacture in Dartford.

The south bank of the Thames with its reserves of chalk and mud turned out to be the ideal location for cement manufacture.

Lime had been used for millennia in the making of mortar to join stone and brick. The Romans built lime kilns to burn limestone and produce quicklime. Such kilns were to be found across Britain where limestone was to hand. In the seventeenth century it was found that quicklime spread on fields would aid the growth of crops by reducing the acidity of the soil. The demand for quicklime kept growing.

There is evidence that as early as 8,000 BC it had been found that the addition of small amounts of volcanic ash gave the lime the capacity to set under water. In England, John Smeaton, known as the father of civil engineering, building the Eddystone lighthouse discovered that the property of hardening whilst submerged in water was linked to the clay content of the cement. In 1824, a Leeds stonemason, Joseph Aspdin, took this a stage further and invented a method of making from limestone and clay a cement which he called Portland Cement given the similarity in colour between it and Portland stone. He patented his invention and his son William exploited it further setting up a manufacturing plant in Rotherhithe. Other plants followed along the banks of the Thames and Medway using local deposits of chalk and clay taken from the mud of the river banks.

It seems likely that Portland cement was used by Marc Brunel in the construction of the Thames Tunnel in 1828. The story is that Brunel had been using the cheaper Roman Cement patented by James Parker of Northfleet in 1796, but the tunnel collapsed. Tons of Portland Cement were poured in and sealed the tunnel which could then be completed.

Limestone was also used as a flux for the smelting of iron to remove the impurity of silica, which when heated combines with the lime to form slag which is then removed and used for road making.

The exact proportion of lime to clay was crucial and depended on the make up of the local deposits used. The mixing would be either using water or by grinding the dry rocks. In time, cement plants appeared across Britain exploiting local mineral deposits and the availability of coal to heat the mixture until it calcined. In 1845, Isaac Johnson, then manager of the Swanscombe Works close to Dartford, fired the mixture to a higher temperature (1400-1450C) until the mixture clinkered. This was then ground to a fine powder and is essentially the Portland cement we use today.

Cement making was a dirty process and the towns folk complained. Johnson though went ahead with larger works at Greenhithe. In time there were some thousand kilns along the banks of the Thames and Medway.

In 1900 the Associated Cement Manufacturers Company was formed bringing together some twenty four companies all but two on the Thames and Medway including two of the early plants Robin's and Swanscombe. This company became Blue Circle Cement and is now owned by the French Lafarge.

Further reading:

• Geoff Porteus, The Book of Dartford (Buckingham: Barracuda Books 1979)

Erith manufacturing history

 Erith was not on Watling Street (unlike neighbouring Crayford) and so until the arrival of the railways it was restricted in industrial activity to that enabled by the Thames, so brick works and loam quarrying principally to provide ballast for ships.

The first manufacturing industry was the engineering factory of Easton, Amos and Anderson in 1864; the last named being also Director General of Ordnance Factories and I wrote about him in the context of the modernisation of the Royal Arsenal at Woolwich. The factory closed in 1904 but left well made pumping engines some of which were still working after the Second World War.

A significant early industrial newcomer was the Callender Bitumen, Telegraph and Waterproof Company in 1880. At this time electric cables were being run for telegraph and soon power transmission. A little further upstream at Woolwich, Siemens was much involved in the same area. The company became Callenders Cable and Construction Company and in 1945 merged with British Insulated and Helsby Cables itself a product of the British Insulated Wire Company which had been founded in Manchester in 1890 by Sebastian de Ferranti, Colonel Pilkington of St Helens and others. British Insulated Callender Cables or BICC (as the combined company became) and its predecessors can claim credit for much of the national grid. In 2000 BICC changed its name to that of its construction subsidiary Balfour Beatty. It had previously disposed of its cable interests.

In 1887, the Nordenfeldt Gun Company built a factory in Erith and a year later combined with Maxim at Crayford. The combined business was then bought by Vickers. The business was renamed Vickers, Sons & Maxim and manufactured many machine guns during the First World War including the heavy 'PomPom' which had been used in the Boer War. Production was moved to other Vickers factories in 1932.

Fraser and Chalmers were to be another Erith manufacturer. They had originated in the USA and had focused on the manufacture of mining machinery. They set up in Erith in 1891, but by 1903 severed all US connections and expanded their range of products into steam plants, milling machinery and general engineering. In 1918, the business was bought by GEC and its was repurposed into manufacturing turbines. In the mid twentieth century it employed 4,000 people in a site extending to thirty-four acres.

Turner's Asbestos Cement Company set up in 1912 to manufacture asbestos roofing material, guttering, piping and fireproof and thermal insulating material. The company was owned by Turner and Newall of Manchester. The subsequent discovery of the dangers of asbestos effectively ended the business.

Continuing with construction, Royal Doulton Potteries made salt glazed stoneware piping. British Plaster Board processed imported gypsum. The Hercules Powder Company and Borax Consolidated Ltd provided raw materials for glass enamel and pottery.

Further reading:

• John A Pritchard, A History of Erith Pt III 1837-1894 ( London Borough of Bexley Libraries and Museums Department 1978)
• John A Pritchard, A History of Erith Pt IV 1894-1965 ( London Borough of Bexley Libraries and Museums Department 1978)

Crayford manufacturing history

 The main route running through Crayford was Watling Street offering evidence of Roman occupation. It was also where Hiram Maxim built his first factory. In nearby Dartford Heath there is evidence of iron smelting using ores from the Weald.

An early industry was silk printing and in the nineteenth century David Evans won a reputation for the excellence of his product. The skill expanded into textile printing more generally. The Swaisland company was said to have made Crayford the 'Mecca of the printing industry in Britain'. The company was bought by G.P. & J. Baker which created iconic designs for their fabric printing. Their archive has been preserved in private hands and inspires some of today's fabric printers. In the nineteenth century this was big business employing massive steam driven machinery. The Calico Printers Ground became a well known place in Crayford where printing had grown out of the bleaching industry, itself the product of Hugenot weavers making their homes here.

Frederick Braby worked with sheet steel in the Euston Road in London and set up a works in Crayford in 1867 to take advantage of the transport facilitated by the Surrey Canal. The works lasted until 1964 latterly supplying the food industry.

Sir Hiram Maxim was also a Hugenot but came to Watling Street, Crayford in 1888 via Hatton Garden and America to which the family had fled. He would be best known for his machine gun, but William Carr also suggests that he took to the air in a steam powered aircraft. Nothing came of this. What did come was an amalgamation with the Nordenfeldt Gun Company which in 1887 had built a factory in nearby Erith. In 1888 Nordenfeldt and Maxim combined their businesses which results in Maxim-Nordenfeldt Gun and Ammunition Company close to St John's church in Erith. In 1897 Vickers acquired the Maxim factory and there developed the Vickers Maxim machine gun.

In the early 1900s the armament works were repurposed to manufacture Wolseley Siddeley motor cars. This came about because John Siddeley was looking for someone to put his all British 100 h.p. car on the market. To do this he joined with Wolseley, then run by Herbert Austin, and Vickers. Austin left to set up on his own and the motor business was moved to Birmingham.

Crayford closed until 1912 when Vickers reopened it for arms production. Crucially they designed a synchronising gear which enabled a machine gun to be fired through the revolving propellor of an aeroplane, also manufactured by Vickers in Erith. After the war, the Crayford factory assumed a key part of Vickers manufacturing capability and I write of this in Vehicles to Vaccines.

Of international significance, a Vickers Vimy bomber built at Crayford but modified at Weybridge made the first trans-Atlantic crossing with Alcock and Brown. The Vickers Vimy powered by a Rolls-Royce Eagle engine proved a success but then a decision was taken to focus aircraft production on Weybridge.

In the Second World War in Crayford, Vickers manufactured armaments including military fire control and aiming equipment and after the war diversified into petrol pumps and packing and bottling machinery.

Given its location much of Crayford's business derived from imports. This the Vitbe Flour Mill was in Crayford. A good deal of timber was imported and at Crayford a portion of this was made into a whole range of different plywoods by the Tucker Armour Plywood Company.

Dussek's Oil Refining and processing works, later bought by Burmah Castrol, had a range of products from which I infer a range of raw materials. Before the drilling for hydrocarbons, oil was derived from plants and seeds, from coal tar and from animal fats. Dusseks specifically used tar and, I infer from their production of putty, linseed oil. This oil is derived from flax and in the nineteenth century the seed was imported from Russia. There is evidence of its processing also in Maidstone. There was a large trade in palm oil from West Africa which was used in making margarine and soap. I wrote about this in the context of Lever Brothers and the United Africa Company in How Britain Shaped the Manufacturing World.

Further reading:

• J.D. Scott, Vickers - A History (London: Weidenfeld and Nicolson, 1962)
• William Carr, The Spot that is called Crayford (Crayford Urban District Council, 1951, 1965)