
economy, driven by steam, also extended markets and such enterprises as Bute Dock, built in Cardiff in 1839, opened up the
export trade. The north-east coast gradually lost pre-eminence to South Wales, at first in the more accessible Aberdare valleys
and later in the Rhondda. Increasingly the export trade came to dominate production. In 1830, 500,000 tons, about 2 per cent
of output, was exported. This had risen to 4 million tons in 1855, and by 1860 10 per cent of coal output was exported: the
basis of Britain’s mid-century growth and dominance.
POWER—WIND, WATER AND STEAM
The stationary steam engine has often been regarded as the single most important invention underlying British
industrialization. Technically the steam engine was seen as ‘prime mover’; that is, it supplied the energy to work the machines
which in turn produced the consumer goods. An exhaustible energy resource, it could be argued, would hamper
industrialization across many sectors. Historically the concentration by historians like Rostow on the late eighteenth century has
implied a concentration on the steam engine of James Watt which improved on the earlier engines of Thomas Savery and
Thomas Newcomen. This view does, however, neglect the importance of developments in steam before 1780 and technical
improvements to existing power sources.
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The steam engine was developed when it was no longer possible to cope with expanding needs by traditional means. Deeper
mining led to an enormous increase in the power needed to keep them dry. In 1702 one Warwickshire colliery was using 500
horses for this purpose. The response was the first commercially successful steam-atmospheric engine developed by Thomas
Newcomen between 1708 and 1712. It was quickly adopted by collieries and was too inefficient and too costly in fuel to be
used widely elsewhere though the high value of tin and lead meant it was used in Cornwall and Derbyshire. By the 1750s demand
for power was again seriously straining available resources. This was clearly reflected in the strong interest which arose at
that time in the improvement of prime movers. John Smeaton applied scale-model techniques to improve the design of both
waterwheels and windmills. This marked the beginning of a long series of advances in design and construction that brought
the waterwheel to virtual perfection by 1830. The windmill was improved by the addition of a fantail mechanism in 1745, the
increased use of cast-iron working parts and the development of adjustable sails. Smeaton also brought the Newcomen engine
to about the limit of its potential (75 horsepower in the 1770s). But it was not adaptable to drive machinery directly but was
frequently installed to pump water to supply a waterwheel for that purpose. James Watt improved on the Newcomen engine in
two important respects. In the mid-1760s he developed a ‘separate condenser’ which reduced the fuel consumption of the
pumping engine. Secondly, he designed the first effective rotative engine in which the motion of the engine could be
communicated directly to machinery—he took out a patent on the ‘sun and planet gear’ in 1781, a double-acting engine in
1782, centrifugal governor in 1788 and steam engine indicator in 1796.
Just how dramatic was the impact of the steam engine and how did this compare with other forms of power? The speed of
diffusion of the Boulton and Watt engines was not as great as historians originally believed. In Lancashire and Cornwall,
where steam power was being most rapidly introduced, Boulton and Watt engines accounted for no more than 35 per cent of
the total in 1800. It is possible to explain this in the following ways. First, the Newcomen engine remained the most important
if not most cost-efficient pumping machine on many coalfields until the 1840s. Secondly, the Watt engine was applied to
machines that already existed and which had been driven by water. Mill-owners or ironmasters had to consider whether the
cost of installing a steam engine or replacing their existing Newcomen machine was economically justifiable. Thirdly, most
workshops were small concerns where installing steam could also prove too expensive given Watt’s control of the market
through his patents until 1800. Watt’s engine had made striking advances in powered mule-spinning and also to carding,
printing and bleaching but its impact elsewhere was more limited. Steam engines were vastly outnumbered by waterwheels
and the great majority of manufactures were still handicrafts.
It was only in the long term that industry was freed from its dependence on water power. J.P.Harris has estimated
conservatively that there were about 1,200 steam engines of all kinds in operation in 1800.
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These produced less than 20,000
horsepower of which Watt’s engines may have contributed 12,500 hp. After 1800 the application of steam engines to textiles,
particularly spinning, accounted for their rapid diffusion. By 1924 there were about 5,000 engines generating 100,000 hp in
industry and mining and by 1850 300,000 hp was generated in industry alone. Factory inspectors’ returns can be used
cautiously to indicate the balance between steam and water power in cotton and woollen and worsted industries. Water power
provided 36 per cent of all power used in the textile industry in 1838 and it was still 19 per cent in 1850.
The quantity of steam power therefore increased after 1800 though as von Tunzelmann argues
Table 5.11 Horsepower used in textile factories
Year Cotton Woollen and Worsted
Steam Water Steam Water
1838 46,826 17,389 17,389 10,405
60 SOCIETY AND ECONOMY IN MODERN BRITAIN 1700–1850