, 1844,
Views of the Collieries of Northumberland and Durham) The coalfield kept up its competitive advantage even after its easily accessible deposits had been exhausted. Although not the only one to innovate, by the eighteenth century the Northumberland and Durham coalfield was the largest and most technically advanced in the world. It has been said that Newcastle was "the
Florence of the Industrial Revolution"; "the north-east was the Silicon Valley of its day".
Deep mining Already maybe by 1600 (but at the latest, 1700) not only had the surface outcrops of coal been worked out, but so had the shallower underground seams where a mine could be drained easily by opening an
adit and letting the water run further downhill. Deep mining became necessary, which brought a host of problems. "In 1700 the deepest mines were already about 300 feet [100 m]. By the 1750s they reached 600 feet. By the 1820s some pits reached nearly 900 feet underground". In 1828 two thirds of the mines were more than 300 foot deep, one third more than 600.
Depth and winning Winning coal is making it accessible for extraction, and in this district it required heavy investment with no guarantee of a return. In
The Coal-Mines of the North of England (1846)
David T. Ansted, professor of geology at
King's College London, wrote: which made for severe ventilation problems. If the shaft-sinking struck water-bearing sands it could become a serious emergency. In sinking the shaft for
Murton Colliery (1838) a torrent of nearly 10,000 gallons (45 tons) of water a minute rushed in, and had to be pumped up 540 feet (165 metres) to the surface, requiring the combined power of 39 steam-engine boilers, before workmen could safely tub off the shaft with cast iron.
Pumping and lifting The main problem was seepage water in the mines, however. In deep mines it was necessary to pump it up, which required a source of power. A common misunderstanding is that mines were pumped by horse power until steam engines were invented. They sometimes were, but
hydraulic power was more effective than either. For this to work, though, a large
catchment area was needed to collect enough run-off water to drive the wheels (called
coal mills); the necessity favoured large landholdings. By 1800 mine ownership in the north east was much more concentrated than in other parts of England. Even so, the region was one of the first to adopt the
Newcomen steam engine, and it installed many, some for pumping water to waterwheels. • Horse-driven cog and rung winding machine. Early machines could be built by local millwrights. "In the Walker colliery in 1765, the deepest mine at that point at 600 feet, coal was lifted from the mine by a gin powered by 8 horses". At that depth the rope weighed more than the load of coal. • Coal mill. For driving mine pumps, these water-powered prime movers were more effective than early steam engines and much more so than horses (Beamish Colliery:
T.H. Hair, 1844,
Views of the Collieries of Northumberland and Durham ). • Pumping engine at Friar's Goose Colliery,
Gateshead (Hair,
Views). Deep mining required heavy investment. •
John Smeaton's water gin, Long Benton Colliery, 1777. Early steam engines were too jerky to drive the winding gear, so they pumped water to overshot wheels, which turned it smoothly. (
Wellcome Collection:
J. Farey, eng. Lowry)
Ventilation at Wallsend colliery, scene of fatal explosions. (T.H. Hair, 1844,
Views.) The mines being deep and the coal
bituminous, explosive gas became a serious problem, and until 1815 had to be dealt with by improved ventilation alone since miners had no practical way of illuminating their work except by the light of a naked flame. The method of
getting coal in this district was
pillar and stall mining, in which the mineral is extracted by cutting a grid of intersecting passageways, leaving thick pillars of coal to support the roof. Besides yielding coal, those passageways were essential for ventilation because, if they were obstructed — even in abandoned sidings — explosive pockets of gas might accumulate and endanger the whole mine; this was appreciated by 1760. Thus, until safety lamps were introduced (see below), a third if not one half of the coal could not be extracted, but had to be left as part of the mine's structure. Ventilation was achieved by heating air in a furnace and letting it rise in the
upcast shaft, thus creating a strong vertical current. A system of closing doors, called
coursing, directed the airflow in a sinuous path through all parts of the mine; but since the pathway might easily be 30 miles long, sometimes as much as 50–70 miles, the current was sluggish, and became dangerously contaminated. An important breakthrough was to divide the air into many parallel currents. Called
splitting, it was devised by
John Buddle at the
Hebburn colliery, and it greatly improved the air's freshness and intensity. A
dumb drift allowed potentially explosive air to escape without dangerously feeding the furnace fire.
Illumination The north east introduced the first practical safety lamps. Following the
Felling mine disaster of 1812, the Society in Sunderland for Preventing Accidents in Coal Mines, in which John Buddle was influential, encouraged investigators to tackle the problem of explosions. Three of these,
William Reid Clanny,
George Stephenson and
Humphry Davy, independently came up with safety lamps, converging on a solution where the flame was shielded by a gauze. They were in use by 1816. The term "safety" was relative, since the lamps were dangerous if incautiously used. Nevertheless, they produced "an entire revolution" in mining. Millions of tons of 'lost' coal were recovered.
Panel working .) The new methods brought new challenges. Removing some coal pillars put extra stress on the rest, which were gradually crushed by the weight of the roof; or the floor buckled. A condition called
creep or
crush developed, which slowly spread as a chain reaction through the district, damaging the coal and, once started, very difficult to stop. John Buddle, regarded as the greatest mining engineer of his day, solved the problem by inventing
panel working, which is still used. The district is divided into panels, isolated by barrier pillars which are wide enough to support the roof and prevent creep. Interior pillars may then be robbed out.
Rail transport technology , British Museum). Notice railway and sailing collier. The north east has been described as the native land of railways. "From about 1620 to 1820 the northern coal-field was the theatre of experiments which culminated in the formation of the
Stockton and Darlington Railway". Even George Stephenson's
standard gauge, now used from America to China, originated from the rail separation used at his employer the
Killingworth Colliery, Northumberland. These early railways were used for carrying coal from mine to tideway, and most were less than five miles long. By 1800 there were perhaps 150 miles of line in Tyneside alone. They originated as follows. Each mine had a
staith, a wooden staging projecting out in to the river where coal could be stored. As mines were sunk further and further from the rivers, they confronted the problem of getting their coals from the pit-head to the staith without incurring ruinous expense. A horse can pull much more on a very even surface. Mines invested in
waggonways, at first nothing more than parallel wooden rails on
sleepers upon which horses could draw trucks. Metal wheels, internally flanged as now, were in use by 1774. Later, and progressively, rails were surfaced with iron strips to reduce wear; cast solid; laid on edge instead of flat; made of
malleable iron. Brakes were improved, hence waggons could be run together as trains. Sometimes gravity was substituted for horse power (self-acting inclined planes: the downward force of the loaded waggons pulled the "empties" up the hill again). Where need be, stationary steam engines pulled cables (1808). Eventually steam engines moved themselves. North-easterners discovered that locomotives could get enough traction from their friction against the rails. Not the world's first public railway, but the first commercially successful one, the 25-mile Stockton and Darlington, carried coals to a hitherto inaccessible river: the Tees. • A 1774 drawing by
Gabriel Jars of the
French Academy of Sciences shows that early Newcastle waggonways had many of the characteristics of modern railways, including metal wheels with internal flanges, rails laid across sleepers, braking, twin tracks and even turntables. (Detail: Notice unequal wheels to counter downhill tipping, back wheels of wood for better braking). By 1795 improvements in braking allowed multiple waggons to be taken downhill as a set — or
train. • Horse-traction was quite adequate for some of these waggonways, which on the outward journey ran chiefly downhill under gravity. The
dandy waggon, an 1826
George Stephenson invention, rested and fed the horse during the gravity runs. The horse knew to trot after the train and jump aboard, which it did avidly. Horse railways continued until 1907. • Whitwell Colliery (Hair, Views) • The world's oldest railway embankment, 1726, built by the Grand Allies for their horse-drawn waggonway to the Tyne. The
Tanfield Railway, a heritage operation, still uses much of this line. • Coal waggons (right, in distance) descend an inclined plane by gravity to waiting keelboats on the River Wear. An endless cable (not visible) returns the empties.
Steam locomotives The high cost of horse fodder during the Napoleonic wars encouraged mine engineers to experiment with steam locomotion, though at first locomotives were not much stronger than the best horses. When the Stockton & Darlington Railway opened it was not obvious that steam was going to cost less than horse power; the directors therefore chose to use both. Visiting engineers from Prussia reported (1826 or 1827) that although the S & D's locomotives incurred half the running cost of horses, it was still not clear that they were cheaper once repairs to engines, rolling stock and rails were taken into account. • Blenkinsop's rack and pinion engine, described as the first actually useful locomotive. • "Puffing Billy", designed by
William Hedley at the
Wylam Colliery in Northumberland, partly rebuilt 1813, shown in this photograph 1862 still at work, and now on view at the
Science Museum, London. (
Ironbridge Gorge Museum Trust.) • Early locomotives with their weight and vibrations soon broke the rails. Stephenson realised that locomotive and track design had to be integrated. In one model his steam-filled cylinders were arranged to act as shock absorbers ("steam springs"). Notice the "fish belly" rail pattern. This was the locomotive used by the Hetton Colliery (below); its private railway was operative (1822) before the Stockton & Darlington. • Locomotive No.1,
Locomotion (R. Wake, 1883, oil on canvas,
National Railway Museum/
Science & Society Picture Library) • Stockton and Darlington Railway 2–2–2 Locomotive No. 52 'Comet' (unknown artist, National Railway Museum) Steam locomotives revolutionised transportation everywhere, but they originated in efforts to carry coal cheaply from mine to first customer.
Bulk material handling and transshipment The coal having arrived at the riverside, the next phase was to
transship it to waiting colliers, the problem being to do it without incurring too much expense and breaking the product in transit (which lowered its market value). The traditional method was to employ
keelboats. These were 21-ton barges, sometimes sailed, but mainly propelled by pushing large poles into the riverbed; the poles were bladed, and also served as steering oars. The four keelmen, having tied up alongside the waiting collier, raised up the lumps of coal with their hands — for which they were entitled to an extra cash payment — and passed them up into her
portholes. Shovels, which might have broken the coals, were thus avoided, except for clearing out the residual dust. For every foot that the coal-port was above the
gunwale they were entitled to another payment. All of this was physically demanding. Keelmen were easily the best paid manual workers in the coal industry, according to John Buddle. The mode was therefore expensive. The north east industry evolved three techniques for reducing labour costs and breakage:- • spouts • drops • tubbing (an early form of
containerisation). • From a 1790
woodcut, British Museum. Coal was loaded directly into the collier through a rectangular tube called a
spout. To reduce breakage the spout was inclined; later models could be adjusted to allow for the tide. There was a trick for minimising breakage. The spout method was of no use for loading colliers if the water was too shallow to admit them. Hence mines above bridge continued to use keelboats; the differential cost was to put a strain on the cartel. • A machine lowered a coal waggon gently onto the collier's deck, restrained by a counterweight. A moveable flap released the coal, whereupon the waggon ascended again lifted by the counterweight. Once again this technique required deep enough water. The peculiar shaped housing is the coal store. Underneath there is a spout for loading keelboats. This was the shipping staith of the famous Wallsend Colliery. (From Hair,
Views.) • The coal was transferred in square
tubs, which were waggons without wheels and held a standard, Customs-certified weight. Eight tubs exactly fitted into a keelboat. On arrival at the collier, which might be anchored in deep water, a crane lifted a tub from the keelboat (left) it and lowered it through the collier's hatchway (right) and into her hold. A moveable flap released the coal. This technique was preferred on the shallow river Wear, where keelboats were crewed by one man and a boy. (From William Chapman's patent drawing, 1822.) Introduced in 1817, it was calculated that this technique saved 45% in labour and breakage costs. It has been described as an early form of containerisation.
Know-how Viewers Colliery viewers were responsible for applying the technologies of the day in the most efficient and effectual manner. They combined the skills of managers, engineers, surveyors, accountants and agents. A consultant viewer offered his services part-time and advised several collieries, often about specific problems. North east viewers had a reputation for technical excellence and were in demand in other coalfields as far away as Nova Scotia and Russia. The best known is John Buddle (above).
Discounted cash flow accounting It has been reported that viewers in the north east were applying
discounted cash flow (DCF) analysis as early as 1801 in connection with the valuation of collieries. The technique, still unfamiliar to some accountants as recently as the 1960s, was called forth by a combination of circumstances, including the need for heavy investment in deep mining, the risky nature of the industry, the sharing of risk between multiple investors, and the delayed accrual of the benefit. ==The cartel: justification, criticism and polemics==