Fire-Starting-art - 9/3/09
"Period fire starting and Archimedes Death Ray" by Viscount Sir Corin Anderson (KSCA, OP).
This article was submitted to me by the author for inclusion in this set of files, called Stefan's Florilegium.
These files are available on the Internet at: http://www.florilegium.org
Copyright to the contents of this file remains with the author or translator.
While the author will likely give permission for this work to be reprinted in SCA type publications, please check with the author first or check for any permissions granted at the end of this file.
Mark S. Harris...AKA:..Stefan li Rous
stefan at florilegium.org
This article was first published in issue number 28 of "Cockatrice", the A&S newsletter of the Kingdom of Lochac.
Period fire starting and Archimedes Death Ray
by Viscount Sir Corin Anderson (KSCA, OP)
In his introduction to the Catalogue of the Bryant and May Museum of Fire-Making Appliances, Miller Christy writes:
'Probably the very earliest method of fire making devised by primitive man was that of rubbing together two dry pieces of wood. The idea of doing this occurred, doubtless, to the mind of some early savage who chanced to see two dead branches of trees take fire through friction when rubbed together by the wind during a storm - a thing which undoubtedly happens occasionally'.
Having experienced the effort required to make fire by the friction method, I would dispute Christy's assertion that the wind would be ever be likely to make 'two dead branches of trees take fire through friction'. It does seem likely, however, that the friction method of fire making is one of the earliest methods of making fire discovered by humans.
Rather than arising from an observation of nature, the discovery of the friction method seems most likely to have developed as an accidental by product of the solution to a very different problem: how to drill holes.
Simple drilling tools, awls, were a very early invention and many stone examples from as far back as the Neolithic period have been discovered.
Neolithic Key Awl
Subsequent advances in drilling technology saw stone awl points attached to wooden handles, which assisted with leverage. Later, the introduction of the bow drill made it possible for the awl to be rotated far more rapidly than by hand alone. It seems likely that the friction caused by these rapidly rotating awls as they drilled through timbers would have caused them to smoke and catch fire, thus requiring only a small intuitive leap to see bow drills as a fire making implement.
Being made of wood, which readily decays, it is not surprising that few prehistoric remains of these tools have been found. Some of the oldest surviving examples date from Egyptian grave finds and there are numerous representations of bow drills in Egyptian art.
Carpentry tools, including bow drill and awls, from Egyptian tomb (1300 BC)
Egyptian wall art depicting the use of a bow drill (1480 BC)
To make fire with a bow drill the drill, a spindle of some hard wood, is looped through the bowstring so that, when held in place, a back and forth motion of the bow will cause the spindle to rotate.
The bottom end of the drill is pressed against a piece of softer wood, called the hearth by modern practitioners, and pressure applied at the top end by a piece of hard wood or stone with a socket made to accept the top end of the drill.
As the bow is moved back and forth the bottom of the drill rubs against the soft hearth board, grinding some of the wood into a powder as well as causing heat by the friction. With enough pressure, speed and time the ground wood powder heats up enough to form a glowing ember, which can then be used to start a fire.
By all accounts, and from personal experience, the bow drill method of fire starting requires a degree of skill and patience.
This difficulty is perhaps the reason why, certainly by the medieval period, bow drills fell out of favour as a method of fire making to be replaced by flint and steel.
The use of flint and steel to strike sparks has its precursor in the same prehistoric period as the bow drill and may, in fact, be older. When flint is struck against rock containing iron, such as haematite or iron pyrites, it can produce sparks. Caught on suitable tinder, these sparks can set the tinder alight and be used to make fires.
Evidence for the prehistoric use of flint and iron bearing rocks to start fires comes from the many gravesites in which worked pieces of the two types of rock have been found. Microscopic analysis of these finds have shown the pyrites or haematite to have traces of flint embedded in their surfaces and vice versa, demonstrating they were indeed struck together.
Paired flint and haematite from a Neolithic gravesite.
It seems probable that the discovery of the ability of flint and iron bearing rock to produce sparks came about, like the discovery of the fire drill, accidentally during the routine manufacture of tools. If, for instance, iron-bearing rock had been inadvertently chosen as a hammer stone for shaping flint tools it would be inevitable that the action of striking one on the other would produce sparks.
From the advent of the Iron Age the haematite or pyrites was replaced with a hardened steel striker. Flint with steel strikers became the most common method of lighting fires up until the invention of modern friction match in mid eighteen hundreds. Thousands of these strikers, from the Iron Age to well past the 16th century, still survive.
Viking Age fire steels from the Birka Graves (10th Century)
The most advanced use of flint and steel to light fires in the period before 1600 occurs in the form of the wheel lock pistol. In the wheel lock pistol a steel wheel connected to a spring is wound up and locked in place by a trigger. A piece of flint is held against the wheel by a sprung arm. When the trigger releases the wheel the wound spring causes it to spin against the flint producing a shower of sparks and, hopefully, igniting the gunpowder in the pan.
Wheel lock pistol (Brunswick,1555).
The mechanism of the wheel lock exists to this day, albeit without the spring, in the thumb wheel of modern disposable cigarette lighter.
Another method used in period to light fires relied on focusing light from the sun. Three variation on this method; crystal and glass lenses, water filled glass globes and parabolic mirrors where certainly known prior to 1600.
A forth method, the use of multiple plane mirrors to focus the suns rays has a parallel in modern high temperature solar furnaces and, by some accounts, a far more sinister application in ancient history.
Crystal lenses go back in antiquity at least to ancient Greece. The Greek playwright Aristophanes (c 420 BC) writes in his play The Clouds:
STREPSIADES Have you ever seen a beautiful, transparent stone at the druggists', with which you may kindle fire?
SOCRATES You mean a crystal lens?
STREPSIADES That's right. Well, now if I placed myself with this stone in the sun and a long way off from the clerk, while he was writing out the conviction, I could make all the wax, upon which the words were
Although no crystal lenses from ancient Greece have been found there are examples of Viking age lenses, thought to have been fashioned with the use of a pole lathes. It is likely that their only purpose can have been for lighting fires since they lack the clarity required for visual magnification.
Viking age turned rock crystal with diagram of refracted light.
The earliest English writer to mention crystal lenses for the correction of vision was Roger Bacon in his 1268 work 'Opus Majus'. By the 1400's spectacles were common in Europe and were now made of cheaper ground glass rather than rock crystal. The market for spectacles advanced the technology of lens production and seems likely to have made the burning lens a commonplace item.
Although Roger Bacon is credited with the first English recording of the magnifying properties of convex lenses, there value was appreciated much earlier than that.
The Roman Seneca, a contemporary of the Emperor Nero (1st Century), described the magnification of writing produced by a globe of water. He wrote the following:
Letters, however small and indistinct, are seen enlarged and more clearly through a globe of glass filled with water.
It seems reasonable that and understanding of the optical qualities of water filled glass globes would lead to their use for starting fires.
Another kind of fire starting device for which there are early references is the parabolic mirror. Diocles, a Greek, wrote his mathematical treatise 'On Burning Mirrors' around 200 BC. In it he describes the geometrical qualities of parabolic mirrors and how their shape concentrates light.
In his introduction to 'On Burning Mirrors' Diocles' writes:
Pythian the Thasian geometer wrote a letter to Conon in which he asked him how to find a mirror surface such that when it is placed facing the sun the rays reflected from it meet the circumference of a circle. And when Zenodorus the astronomer came down to Arcadia and was introduced to us, he asked us how to find a mirror surface such that when it is placed facing the sun the rays reflected from it meet a point and thus cause burning.
Diagram from a medieval copy of 'On Burning Mirrors'.
The burning effect of parabolic mirrors was certainly known in the renaissance. In 1515, at the age of sixty three, Leonardo da Vinci wrote about burning mirrors and how, forty five years earlier, he had witnessed the use of parabolic mirrors to solder together the segments of the large gilded copper ball that adorns the dome of the Santa Maria del Fiore in Florence.
The gilded copper ball atop the dome of the Santa Maria del Fiore in Florence.
Arguably, the most sinister record of the use of burning mirrors comes from descriptions of Archimedes and his role in the defence of Syracuse against the Romans in 212 BC.
An example of such account comes from the 11th century historian Johannes Tzetzes.
When Marcellus withdrew them [his ships] a bow-shot, the old man [Archimedes] constructed a kind of hexagonal mirror, and at an interval proportionate to the size of the mirror he set similar small mirrors with four edges, moved by links and by a form of hinge, and made it the center of the sun's beams – its noon-tide beam, whether in summer or in mid-winter. Afterwards, when the beams were reflected in the mirror, a fearful kindling of fire was raised in the ships, and at the distance of a bow-shot he turned them into ashes. in this way did the old man prevail over Marcellus with his weapons.
Earlier accounts from Lucian and Galen (both 2nd century A.D.) also mention the burning mirrors:
And Lucian, speaking of Archimedes, says, "that at the siege of Syracuse, he reduced by a singular contrivance, the Roman ships to ashes." And Galen, "that with burning glasses, he fired the ships of the enemies of Syracuse."
While we may never know the authenticity of the accounts, several modern researchers suggest that it was certainly a possibility.
In one experiment a Greek scientist, Dr. Ioannis Sakkas, curious about whether Archimedes could really have used a "burning glass" to destroy the Roman fleet in 212 BC lined up nearly 60 Greek sailors, each holding an oblong mirror tipped to catch the Sun's rays and direct them at a wooden ship 160 feet away. The ship caught fire at once. Sakkas said after the experiment there was no doubt in his mind the great inventor could have used bronze mirrors to scuttle the Romans.
Greek sailor line up to burn a wooden ship in Sakkas' experiment.
Copyright 2006 by Gerard Tops. <gerardtops at yahoo.com.au>. Permission is granted for republication in SCA-related publications, provided the author is credited. Addresses change, but a reasonable attempt should be made to ensure that the author is notified of the publication and if possible receives a copy.
If this article is reprinted in a publication, I would appreciate a notice in the publication that you found this article in the Florilegium. I would also appreciate an email to myself, so that I can track which articles are being reprinted. Thanks. -Stefan.