around Nova Scotia
Arcadia – cast iron cannon
Bay View – cast iron cannons
Bear River – cast iron cannon
Blockhouse Hill – cast iron cannon
Chester – cast bronze cannons
Chester Legion – cast iron cannons
Digby Loyalist Park – cast iron cannons
Five Houses – cast iron cannon
Fort Anne – cast bronze cannon
Fort Edward – cast iron cannons
Fort Point – cast iron cannon
Green Island – wrought iron cannon
Cannons and Gunpowder
Table of Contents
Firepower and Fertilizers
GunpowderGunpowder arrived in the West from China via Byzantium and Islam, and directly from the Mongols. The Mongols pioneered the use of lengths of bamboo packed with gunpowder as "pipe bombs" to help blow open city gates, and they brought this technology with them during their ravages of Poland and Hungary in 1241. Roger Bacon already had a recipe for "black powder" before 1300, and a contemporary, Marcus Graecus, discussed it in his best-selling "Book of Fires for the Burning of Enemies." By 1326 there is a picture of the new European invention, the cannon.
Since the Europeans had a thriving metal mining, smelting, and manufacturing industry, it was quickly converted to the improvement of the new weapon. Paradoxically, it was the skill of medieval bell makers, originally perfected to cast large bronze cathedral bells, that allowed the Europeans to jump quickly ahead of the Chinese in weapons technology. By 1430, European bombards were 4m long (12-15 feet), and fully capable of knocking down contemporary castle walls. Sultan Mehmed "the Conqueror" was able to take Constantinople in the great siege of 1453 because he hired Christian metal-smiths from Transylvania to cast him a new cannon, 8m long and firing stone cannon-balls that weighed 500kg (half a ton). At the same time the French were driving the English out of the last of their castles in northern France with the new weapons, bringing an end to the Hundred Years' War: the English leader, the old Earl of Shrewsbury, was actually killed by a roundshot at the battle of Castillon in July 1453. Another early casualty of cannon was James II of Scotland, who was killed in 1460 when his own cannon "The Lion" exploded as he was standing beside it watching it bombard Roxburgh Castle.
Early Western gunpowder was called "black powder" because it consisted of a finely ground charcoal base, mixed with sulfur and saltpeter (potassium nitrate). Saltpeter was the ingredient that was most difficult to obtain, and since it is the major ingredient in gunpowder best suited for military use, it was the supply of nitrate that became strategically important. By the end of the 1500s, the standard formula for military-grade gunpowder was saltpeter, sulfur, and charcoal dust in the ratio 6:1:1.
At this time, the only source of potassium nitrate was from rotting organic matter, especially rotting meat and urine. The saltpeter supplier would send out teams of collectors who would locate promising places to dig (abandoned privies and dungheaps) by tasting the soil before digging it out and carting it off to be boiled, strained and evaporated to produce saltpeter of the required purity. It is said that throughout Europe no privy, stable, or dovecote was safe from saltpeter collectors or "petermen".
The English set up a Parliamentary Commision in 1606 to look into abuses of property by petermen. However by 1624 King James I issued a proclamation complaining about citizens who were placing their selfish interest above that of their country by paving barns or putting down plank walkways, interfering with the accumulation and ripening of saltpeter in the dung and urine. Every kingdom was desperate for gunpowder, which probably accounts for the continuing use of swords, pikes, and bows, long after firearms had made them technically obsolete.
Eventually a saltpeter industry grew up, based on artificial nitre beds, in which layers of decaying organic matter, old mortar, and earth were built up in a compost heap about a meter high, and sprinkled regularly with blood and/or urine. Nitrate crystals could be collected after about two years. In 1626, King Charles I of England ordered "his loving subjects [to] carefully and constantly keep and preserve in some convenient vessels or receptacles fit for the purpose, all the urine of man during the whole year, and all the stale of beasts which they can save and gather together whilst their beasts are in their stables and stalls, and that they be careful to use the best means of gathering together and preserving the urine and stale, without mixture of water or other thing put therein. Which our commandment and royal pleasure, being easy to observe, and so necessary for the public service of us and our people, that if any person do be remiss thereof we shall esteem all such persons contemptuous and ill affected both to our person and estate, and are resolved to proceed to the punishment of that offender with what severity we may."
Naturally there was no gunpowder left over for commercial purposes such as rock blasting in mining or canal building. Hard rock had to be excavated out by hand with hammers and picks and wedges, or it had to be fire-mined.
By the 18th century India had emerged as the principal source of saltpeter. During the Seven Years' War the British defeated the French in India, cutting them off from this supply. It is said that the French had to make peace partly because they were running out of powder.
GuanoGuano is accumulated bird dung. It can accumulate only in areas with dense bird populations and little rain, but in those special environments it can eventually form deposits many feet thick. As it accumulates and dries, it becomes a dense organic material that is very rich in nitrate and phosphate. Around the world, guano deposits are usually found on dry oceanic islands lying in the middle of oceanic upwelling regions that support very rich fisheries. Living off the fish, and concentrated in great numbers by the small areas of available nesting sites, literally millions of seabirds, each excreting about 20 grams of dung a day, can generate massive amounts of guano.
Around the world, the most productive guano islands have been along the equatorial upwelling zone, especially in the Pacific, and in the great cold currents of the world: the Humboldt Current off South America and the Agulhas Current off South Africa. The word guano is a corruption of a Peruvian word huano, written phonetically in Spanish as guano and then mispronounced by English-speakers. As far as we know, the ancient Moche people along the Peruvian coast were the first people to exploit huano on any large scale, mining the offshore islands to support large populations on their irrigated coastal fields. The tradition was continued by the Incas, so that huano ranked with gold in some ceremonies, and nesting seabirds were placed under protection.
Guano usage dropped as the Spanish essentially destroyed Inca society, but the tradition was not lost. "Guano, though no saint, works many miracles," said a Peruvian proverb. One of the first acts of the newly independent Peruvian government was to exempt guano from taxes in 1830.
As the old Spanish silver mines gradually were worked out, or flooded, the Peruvians began to try to export guano. Trial samples were well received in England, and the Peruvian entrepreneur Quiros put together a consortium of Peruvian, French, and English businessmen who bought from the Peruvian government an exclusive licence to mine and export guano for six years. In 1840 and 1841 they mined about 8000 tonnes of guano, and exported it, mostly to England, at an enormous profit on a wave of favorable publicity. Late in 1841 the Peruvian government realized that it had sold the monopoly too cheaply, and first negotiated a new deal and then nationalized the guano industry outright. It used much the same set of shippers as its agents, still leaving them a healthy profit, but keeping more of the proceeds.
For many years the three Chinca Islands, 120 miles [190 km] south of the major port of Callao, were the main focus of guano mining. The Peruvian government organized guano mining on the three islands. The guano was sold directly to the trading companies that held the government licenses to export it. Vessels from many nations were hired to ship out the guano, each vessel being loaded from barges in bad weather, and down long canvas chutes from the clifftops in good weather. Eventually, enough guano was removed that a flat area could be carved out on one of the islands, and on a very unsavory foundation of solid guano were erected the headquarters for the Peruvian Governor, the British consul, the offices of the exporting companies, and the barracks for the laborers and the guards that acted as their overseers. Peruvian, British, and United States navy ships called regularly at the islands to make sure that operations were running smoothly.
Conditions were ghastly: the stench of ammonia pervaded the entire island. Probably the best living conditions were on board the dozens of guano ships that were there at any one time (it took about three months to load a ship from the barges that plied to and from the guano islands). Even then, as guano dust billowed out from the holds, crews often took to the rigging to avoid breathing it. The "trimmers" working to balance the load in the holds were not so lucky, and could only work twenty minutes at a time. A ghastly array of occupational diseases continually thinned the work force. The Peruvian government used convicts, indentured Chinese, and kidnapped Polynesians as laborers in these terrible conditions. The Peruvians and Chileans practically depopulated Easter Island and Tongareva in this way, before international outcry stopped the virtual slavery.
The Peruvian government derived most of its income from the guano trade from the early 1840s. Guano was Peru's leading export in the 1850s and its largest source of revenue, with 300 shiploads of guano a year leaving Peru, most of them in American ships. For a while Peru was the only organized nation in the world without internal taxation, and the Peruvian president's salary was twice that of the President of the United States. Peruvian Governments could issue bonds at 3% interest, lower than United States Government bonds! The first railroad in South America was built from Callao to Lima. However, it's hardly surprising that the money that flowed from guano should have been illegally diverted on occasion, and that successive Peruvian governments fell victim to greed, corruption, and overspending.
The British firm of Antony Gibbs & Sons of London played a major role in the guano industry. Gibbs had been merchants in Lima since Spanish colonial days. They signed their first guano-trading contract with the Peruvian government in 1842, and their last in 1861, though there were periods where they lost the contract. At times Gibbs was the dominant company in the guano trade, primarily because from 1847 onward it held the monopoly of selling Peruvian guano (the best in the world) in Britain and North America. In the 1840s Gibbs was buying guano in Peru for $15 a ton, and selling it for an average of $50 a ton. In most years Britain was the major market for guano, generally importing about 100,000 tonnes a year, but 200,000 tonnes in 1850, and more than 300,000 tonnes in 1858. The peak for American imports was 176,000 tonnes in 1855.
By the early 1850s, entrepreneurs were prospecting for alternative sources of supply, and lower-quality guano was being shipped to Europe and North America from various Atlantic, Caribbean, and Pacific islands. The State of Maryland even hired a guano inspector to test quality, and levied a charge of 40¢/tonne for the "grade stamps" on the sacks.
Guano fever swept American farmers, especially those who had suddenly realized that crop yields were dropping as they exhausted their soil. The United States Senate debated guano in 1850, and President Fillmore referred to the urgent question of the nation's guano supply in his State of the Union Address in December that year. The United States tried in vain to negotiate a treaty with Peru for a cheap stable guano supply. Guano made up 22% of the nation's commercial fertilizer in 1850, and 43% in 1860, at a price around $73 per ton.
Britain, the USA, France, and Germany were all major guano importers, and it was probably the interest of so many powerful countries in the trade that allowed Peru to keep control: each power would resists occasional attempts by the others to muscle in on the Peruvian end of the trade.
In these early years of the guano trade, demand always outstripped supply. In 1852 there was a bizarre attempt by a Brooklyn entrepreneur, Alfred Benson, to persuade the United States Navy to protect his ships from Peruvian "interference" while he mined guano from the Lobos islands, 20 to 40km offshore from Peru in what was commonly accepted at the time as international waters. Benson owned a fleet of ships that routinely made the Cape Horn voyage out to gold-rush California, but generally returned with little cargo. If they could load guano off Peru, reasoned Benson, he could make literally millions of dollars. However, the British and the Peruvians were well aware of the rich guano deposits of the Lobos Islands. The Peruvians had declared them off-limits to mining (they were to be a reserve to be exploited once the Chinca Islands were depleted) and the British were already on record as regarding the Lobos islands as Peruvian possessions. Benson's scheme was thwarted, but William R. Grace entered the guano market in 1854 in a much more legal way, by supplying the miners of Chinca and shipping out guano, in a trade that began the great W. Grace & Company.
However, Americans looked toward discovering guano deposits in less contested territory, at a time when the United States was in an expansionist mood. In 1854 and 1855, Americans began to mine guano from several islands in the southern Caribbean, trying to keep ahead of the Venezuelan government's attempts to stop them or make them sign lucrative contracts. Meanwhile, in 1855 the ill-fated Alfred Benson formed the American Guano Company to mine some newly discovered islands in the equatorial Pacific, this time hundreds of kilometers from land, uninhabited, and rich in guano; and he persuaded Senator Seward (eventually of Alaska fame) to sponsor the Guano Islands Act of 1856, which encouraged entrepreneurs to claim such islands as American territory: the first American overseas territories. Within ten years, areas of the central Pacific were sometimes labelled "American Polynesia" in atlases, as 59 islands, most of them in the Pacific, were claimed and registered with the State Department as guano islands. Even the Hawaiian Navy got into the action, as Kamehameha IV tried to annex Johnston Island to his Kingdom in 1858, and succeeded in annexing Palmyra in 1862.
By the time the guano trade had become large and profitable, and the Peruvian government was receiving a very healthy share of the proceeds, though Gibbs was flourishing too. From 1849 to 1861, for example, the Peruvian government's revenue was 65% of the gross proceeds from guano, with shipping costs eating up much of the rest.
The problem for the Peruvian government was that it usually spent each year's guano income before it received it, borrowing money all the time. Thus the nation ended in 1861 practically bankrupt. For example, Gibbs paid the 1842 contract money in advance as a loan to the Peruvians, and 84% of it was spent on equipping the army for a war against Bolivia. Gibbs maximized their profit by selling 90% of their guano through their own agents in London, Liverpool, or Bristol, where Gibbs agents operated. Guano continued to be exported to Britain for a number of years at about 150,000 tonnes per year during the 1860s, but with the advent of nitrates and mined rock phosphate, the guano trade diminished considerably because the new products had a high and more reliable quality. In the 1870s the guano market crashed: tonnages dropped to about 100,000 a year, and petered out by 1885. However, I can still buy it for my organic orchard.
NitratesChilean nitrates were the chief source of nitrogen for explosives, fertilizer, and chemical industries from the 1830s to the 1930s, and were the only significant source of iodine from the 1870s (replacing seaweed) until the mid-20th century (when iodine began to be extracted from oilfield brines).
In 1830, a shipment of 700 tonnes of nitrate left Tarapaca, southernmost Peru. The industry mushroomed, and annual exports were 16,000 tonnes by 1843. The peak was not reached until the rather unusual conditions of World War One, when production reached nearly 3 million tonnes. The all-time record was set in 1928, at 3.1 million tonnes.
The nitrates occur in what are now Chile's two northern provinces, Tarapaca and Antofagasta, along a band 30km wide and 700km long. They seem to have formed in shallow playa lakes, where the saline water contained bacteria that fixed nitrogen into nitrate.
In 1868 there was a boom in nitrate mining in the Atacama Desert, and major nitrate ports were developed from Iquique in the north through Pisagua and across the Atacama desert to Taltal. The nitrate mining was dominated by British and Chilean enterprises, even though the Atacama Desert was formally part of Bolivia. Chile had recognized Bolivia's title in an 1874 treaty, but was allocated economic rights there, including a guarantee that taxes on Chilean mining enterprises would not be raised.
For Peru, nitrate was rather unimportant as long as the guano trade was flourishing: in fact, most of the early nitrate mining on Peruvian and Bolivian territory was done by Chilean and British entrepreneurs. However, in 1875 a particularly impoverished Peruvian government declared nitrate deposits to be the property of the state, copying the declaration covering guano decades before. By this time the governments of Peru, Bolivia, and Chile, had all focussed their attention on control of the nitrate region.
In another of its economic crises, the Bolivian government announced a tax increase of 10 centavos per hundredweight on nitrates in 1879. At that time the largest nitrate mining company was the Antofagasta Nitrate and Railroad Company, a Chilean firm controlled by British capital, including the merchant house of Gibbs. It's not clear what part was played by Gibbs in the politics of this incident, but the Chileans mobilized with the intention of seizing the desert. The Peruvians expressed the intention of mediating the dispute between Bolivia and Chile, but when it turned out that there was a secret treaty between Peru and Bolivia, the Chileans declared war on them both.
The War of the Pacific may have been started as much by national rivalry and runaway emotion as by the economic prize of the nitrate deposits themselves. However, the nitrate prize was enough to give the victor the income of an entire nation, and the combatants were acutely aware of that. Peru's income had been largely based on guano and nitrate for decades; Bolivia's economy was ramshackle at best, but its foreign income was based on metal mining in the Altiplano; and Chile had already had a taste of the riches to be gained from the Atacama mines it was already operating.
Early in the War, W.R. Grace allied itself with the Peruvian government, and became a clandestine arms shipper to Peru. It bought and shipped millions of dollars' worth of armaments, including guns from Krupp and a new naval weapon, a torpedo boat. However the Chileans quickly beat both their opponents and went on to occupy Lima.
Chile's victory in the War of the Pacific gave it full control of a large northern strip of coast. Iquique was the terminus of the Nitrate Railways and the most important outlet. At first Tarapaca province was dominant, with 48 out of Chile's 53 nitrate works in 1892. But twenty years later the southern fields of Antofagasta, linked by a new railroad, the Longitudinal Railway, overtook the northern field in production.
Nitrate played an increasing role in Chile's economy after the War of the Pacific, as copper production declined. By the late 1880s an export tax on nitrate was earning 43% of Chilean government income, and in 1894 it was 68%, and the wealth was used to improve the country's infrastructure. The nitrate industry, however, was largely foreign owned. European capital had bought out Chilean entrepreneurs in Chile, Peru, and Bolivia, even before the War of the Pacific. The major reason was the large amount of capital needed to set up the nitrate works, the infrastructure in the difficult desert regions that contained the nitrate deposits, and the railroad and port facilities that were needed, and the continuing requirement for importing supplies. Capital on this scale was simply not available in South America, nor were the basic supplies to support the industry. For example, foreign coal constituted 20% of Iquique's imports in 1909. In fact, a convenient two-way trade of coal for nitrate favored British shipping firms, who loaded 60% of the nitrates even though most of the nitrate went to European countries.
Synthetic production of nitrates surpassed Chilean mining production in the 1930s. By 1950 the Chilean production was only about 15% of world supply, and by 1980 it was only 0.14%. Today the Chilean reserves total only about a year's worth of world consumption, not because they are close to exhaustion, but because world demand has increased so much.
— Notes for Geology 115, by Richard Cowen
Geology Department, University of California at Davis
Nowadays, cannon and other forms of artillery from the 1700s and 1800s are nothing more than quaint noise-makers. We see them only in the movies and on TV, or at occasional demonstrations at historic sites.
In their day, cannons were the most powerful, far-reaching and fearsome weapons available.
From clumsy beginnings in the mid-1300s, by the 1700s cannons had become products of sophisticated technology that required advanced design and manufacturing techniques available only in a few leading industrial countries.
Beginning in the 1600s, the technology of artillery was strongly influenced by scientific developments in physics (force, pressure, acceleration, gravity), mathematics (trajectories), chemistry (explosives) and metallurgy.
Cannons were complicated and expensive to manufacture and hazardous to use. They could be operated only by highly-trained gunners – secretive men with mysterious knowledge and skills and limited life expectancy.
Artillery could destroy walls of cities and fortresses. It could annihilate whole bodies of troops instantly, and at a greater distance than any other weapon.
— Excerpted and adapted from
A Primer on Artillery, by Joe Craig
Saratoga National Historical Park
What does “ordnance” mean?
Ordnance Instructions for the U.S. Navy, 1866
How to Load a Naval Cannon
The hardest part of loading and firing a muzzle-loading naval cannon is learning
the vocabulary, because manuals are written in the language of a sailor.
Advice: Never stand directly in front of a cannon...
Dangerous to Use
The early cannons were
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On 19 April 1989, at sea 260 nautical miles [480 km] northeast of the island of Puerto Rico, 500 pounds (225 kg) of high explosive propellant charge exploded in the open breech of the center 16-inch cannon in gun Turret No. 2 on the USS Iowa, killing 47 crewmen within the turret. The Iowa, one of four World War Two battleships taken out of mothballs during the Reagan arms buildup, had been about to commence a day of test firing its guns, the world's largest naval weapons, 16-inch (41 cm) cannons that fired 2,700-pound (1225 kg) projectiles up to 24 miles (38 km).
The following refers to the British Expeditionary Force (the British Army) on the Western Front in France, 1914-1918:
...When the shell was fired from the gun, the pre-cocked detonator would be activated inside the barrel of the gun or, perhaps, within a few feet of emerging from the barrel with catastrophic results for the gun crew and anyone else in the vicinity. In 1916, during the First Battle of the Somme, these 'prematures', as they were called, occurred in around one out of every thousand shells fired. In some divisions during the Somme Offensive, 500 rounds were fired every 24 hours, thus, on average, one 'premature' was occurring every two days or so. The effect on the morale of the gunners of this macabre game of 'Russian Roulette' can be readily imagined...
Duds On The Western Front In The Great War 1914-1918 The Western Front Association
More about exploding cannons:
The Cannon is Broken! by Edwin R. Scollon
A cast-iron cannon is known to have exploded in Lunenburg County, Nova Scotia, in 1897. It was located on Oxner's Hill, at the mouth of the LaHave River, and was one of three cannons being fired in a Royal Salute probably at the time of Queen Victoria's Diamond Jubilee, the sixtieth anniversary of her accession to the throne in June 1837.
Cannons on Ships
Notes on Sailing Warships
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An 18 pounder long gun with a charge of 5 pounds of powder was capable of penetrating nearly 2½ feet into oak at a range of 400 yards, and over one foot at 1000 yards.
[An 18 pounder long gun with a charge of 2.2 kg of powder was capable of penetrating about 70 cm into oak at a range of 400 m, and over 30 cm at 1000 m.]
June 1740: Testing the Strength of Gunpowders from each of four ships
There was much variation in
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History of the Confederate Powder Works, by Col. (General) Geo. W. Rains, late of the Confederate Army.
Address delivered by invitation before the Confederate Survivors Association, at its fourth annual meeting, on Memorial Day, April 26th, 1882.
Confederate Production of Gunpowder During the Civil War
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Adding Firepower with the Invention of Gunpowder
Caveman Chemistry: Chapter 18, Spot and Roebuck
You take something that everybody's got and nobody wants and turn it into something that every government needs if it's going to be a government for any time at all...
Cast Iron Cannons
Medieval Weapons of
The Weald Iron Foundries
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