
| Lighting - living in the bush |
| The early settlers living in the bush
had to improvise when it came to lighting their humble dwellings.
They were limited to using what resources they had and mostly used the
light of the cooking fires.
The only form of consistent
lighting was produced from candles and children right up to 1920 had to
study their schoolwork by candle light . It
was a daily necessity after sunset. The first fuels, whale and other
animal fats, had a wretched smell and produced smoke as badly as tallow
candles. Having to rely on
candles and crude lamps restricted people and their activities to the
natural daylight hours. |
Early lighting
| In the
earliest Colonial days even the simplest candlesticks were rare, and the
tallow candles were often placed on candle beams simply crossed sticks
of wood or pieces of metal with sockets in them. Simple stands were also
used, and a sort of wall sconce called a prong or candle arm. |
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Candles making began in the thirteenth century when traveling
chandlers went door to door, dipping tapers from patrons' tallow or
beeswax. Candle molds made of tin, wood, or copper were also used.
Candles have to be placed in something substantial to prevent fires, so
candleholders were designed to offer a choice of lighting material. As
the availability of candlesticks and candleholders reached middle class
households in the 1700s, living standards improved greatly. Brass, wood,
pewter, clay, and iron were common materials for candlesticks, although
the upper class preferred candlesticks made of silver or brass. (Many a
convict was sent to Australia for stealing the 'candlesticks".)
Candle lanterns made of tin, iron, wood, glass and horn allowed light to
be portable. The word "lantern" evolved from the term "Lanthorn"--thin,
translucent sheets of flattened cattle horn which light could pass
through.
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Candles were sometimes used to tell
time. Uniform candles of weight and size were “banded” at equal
intervals indicating the passing of one hour per band. |
To snuff a candle means to trim the
wick, not extinguish the flame. Snuffers look like a pair of scissors
but only open beginning at the snuff box. The point on the snuffers was
used to straighten the wick before trimming it.
Candle boxes were placed
conveniently in the house. They were both free standing and hung on the
walls. They were made of wood, brass, sheet iron, and tin. Every home
would have had some kind of a candle box. |
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Punched tin lanterns were a fairly common and cheap type of lantern.
Panels of glass were often used in tin and wood lanterns to allow for
better illumination.
Lamps burned many types of
oil, from animal oils or grease to fish oil to whale oil.
Beeswax
candles burn significantly longer than petroleum based, paraffin
candles. They also have the highest melting point of any known candle
wax.
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The iron Betty lamp
produced comparatively good light. The amount of light varied with the
size and material of the wick. An improvement over other spout lamps,
Betty lamps were rather messy to deal with and, thus, were used by
farmers and tradesmen rather than the wealthy.
These lamps burned many types of oil and were extremely handy for
household illumination. In isolated rural areas Betty lamps were used
until the mid to latter part of the 19th Century. The simple iron Betty
lamp produced comparatively good light for its time. The light varied
with the size and material of the wick. Animal oils or grease were
commonly used as fuel in these lamps. Fish oil gave the poorest light
and was very smoky. Animal fats were somewhat better but still burned
with an odor. Whale oil was much sought after as it produced the best
light. It usually was available in coastal towns but not always in
rural areas. Whale oil gives off light about equal to that of two
ordinary candles. This fuel was always expensive and highly sought after
Early settlers burned fish oil or fat trimmings and had wicks of twisted
cloth. These lamps were smoky, smelly, and the wicks often drew up oil
quicker than it burned, allowing the surplus to spill over the sides of
the lamp onto anything that rested beneath them.
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A
wickholder in the base was added to the crusie lamp design which
channeled the drippings from the wick back into the bowl of the lamp
where it could eventually be consumed. A cover was added to confine
heat, decrease smoke, and make the oil burn efficiently. These changes
also reduced the chance of dangerous house fires.
Many
house fires and deaths were caused by the lamps and candles.
Curtains or nightclothes caught on fire with no more than a slight
breeze to brush fabric against the exposed flame
Burning whale oil in lamps led to the
vertical wick tube. Such a tube had not been possible until finding a
thin enough product to carry the fuel from the font to the top of the
wick. Although whale oil was costly due to the difficulty and danger of
whaling, the quality of light it delivered made it the oil of choice
from the 1840s to the 1860s. 1854 was the high point of the whaling
industry, with whaling vessels bringing home $10,766,521 worth of whale
oil and bone, oil sold for $1.44 per gallon the disagreeable-smelling
whale oil produced a higher degree of candlepower than anything
else,Although whaling didn’t end technically until 1924, it started
declining in the 1860s, to be replaced by petroleum products or lighting
fuels
Even after the invention of wax candles,
tallow remained more popular because the British tax on wax was eight
times more than the tax on tallow. So only the wealthy could afford wax
candles to light their homes. The taxes were dropped in 1831, after
which wax candles came into more popular use.
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| KEROSENE OR SHALE OIL
LAMPS |
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Although petroleum had been
discovered in 1814 and was dug from wells, it was a long
time before the process of distillation made this thick
oil usable in lamps. It also required the, by now
familiar wide, flat wick, which required a burner
designed for it, which, in turn, led to many patents for
improvements on wicks and on burners.
Kerosene lighting was
followed
Oil lamps were used by
the Romans and ancient Greeks, although these lamps did
not reach their full potential until the discovery of
petroleum and one of its distillates, paraffin. Paraffin
lamps then became the preferred mode of lighting because
they were brighter, cheaper and safer than candles |
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By the early 1800s whale
oil lamps represented the earliest large-scale use of glass to produce a
lamp form. Whale oil was quite expensive (nearly $2.00 a gallon then,
which roughly converts to $200 in today's money). A whale oil lamp is
distinct from other early lamps in its burner configuration. The wick
holders are one or two short tubes about ¼ inch in diameter and close
together. A challenge in burning whale oil was keeping the fuel liquid
enough to be taken up by the wick. Whale oil thickens when cool so the
flame was, by necessity, close to the font (fuel holding bulb) so that
heat would transfer down the metal wick tubes to warm the fuel oil! Few
could afford whale oil, desired for its brighter light and cleaner burn,
and lamps designed to burn it are not common today. Most homes used lard
oil or some other rendered fat and often non-glass lamps or candles. In
the first half of the 19th century, the most common light source
remained candles and the natural light from the fire on the hearth.
The success of affordable soda lime glass and the new fuel source boomed
kerosene burning lamps and coal oil lamps by the 1870s |

The first metal burners, devices to
hold the wicks, were introduced in the 1700s. Glass chimneys were first
employed in the 1700s to protect the flame and control the air flow. In
1783 a Swiss chemist, Ami Argand, applied scientific ideas and developed
a hollow circular wick surrounded by a glass chimney. The appearance of
glass chimneys on lamps was not common until the 1800s. With Argand's
innovations, the era of successful lamps had begun. The Argand ideas are
today recognized as the basic principal behind such successfully styled
lamps as Aladdin lamps |
| Lamps
preceded the candle as a light source. Liquid fuels of whale oil, cod
liver oil, and animal fats were used. Camphene refined from turpentine
and kerosene (paraffin) entered in the mid-nineteenth century and
quickly overtook the fish and animal based fuels in popularity.matches
Sulphur matches
were used to transfer the fire from the tinder to light a spill. The
tinder was then extinguished by smothering. A spill was a twist
of paper or slip of wood that was used to light the hearth fire or
candles. |
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How does a candle work?
Candles really are an amazing
lighting system -- the fuel itself is the package. There are two
parts that work together in a candle:
- The fuel, made of some sort
of wax
- The wick, made of some sort
of absorbent twine
The wick needs to be
naturally absorbent, like a towel, or it needs to have a
strong capillary action (as in glass fiber wicks used in oil
lamps). If you buy a length of un-waxed wick at a craft store
and play with it, you will find that it feels like soft string
and absorbs water very well. This absorbency is important in a
candle because the wick needs to absorb liquid wax and move it
upward while the candle is burning.
Paraffin wax is a heavy
hydrocarbon that comes from crude oil (see
What is
the difference between gasoline, kerosene, diesel fuel, etc.?
for details on how things like
gasoline
and paraffin wax are made from crude oil). When you light a
candle, you melt the wax in and near the wick. The wick absorbs
the liquid wax and pulls it upward. The heat of the flame
vaporizes the wax, and it is the wax vapor that burns.
You can prove that it is wax vapor, rather than liquid wax, that
is burning with two experiments:
- If you place one end of a
metal or glass tube (shaped like a thin straw, 4 to 6 inches
/ 10 to 15 cm long) into a candle's flame at a 45-degree
angle, you can then light the upper end of the tube. The
paraffin vapor flows up the tube and is the fuel for this
second flame.
- When you blow out a candle,
you notice a stream of white smoke leaving the wick. This
stream is paraffin vapor that has condensed into a visible
form. It continues to form as long as the wick is hot enough
to vaporize paraffin. If you touch a lit match to the
stream, a flame will run down it and re-light the wick.
The reason the wick does not burn is
because the vaporizing wax cools the exposed wick and
protects it. You may have seen the camping trick of boiling
water in a paper cup. The cup does not burn because the water
inside cools it. The liquid wax does the same thing for the
wick.
Paraffin wax will burn on its
own, but it is like cooking oil, motor oil and coal in that you
have to get it very hot for combustion to begin. An oil fire is
intense and very hard to put out. Paraffin is the same way. In a
candle, this works great -- only the tiny amount of wax on the
wick is hot enough to vaporize and burn.
http://www.howstuffworks.com/question267.htm
Temperature of a Candle Flame
The Physics Factbook™
A bit of Science
In a candle flame a quarter of the energy
created, is released as heat, which radiates in many directions. Only the 4% of
the candle's heat goes into melting wax. There are three main reaction zones in
a candle. The part where combustion starts is called the primary reaction zone.
In the main reaction zone, the process of burning ends. The luminous zone is
where the free carbon burns and releases light. The burning of a candle flame is
a very complicated process. Liquid wax is drawn up the wick by capillary motion
and vaporized with oxygen. The remaining carbon dioxide and water form many
kinds of complex carbon-rich particles called soot. Soot is raised up to the top
of the flame where the very strong temperature burns it.
Color tells us about the temperature of a candle
flame. The outer core of the candle flame is light blue -- 1670 K (1400 °C).
That is the hottest part of the flame. The color inside the flame becomes
yellow, orange and finally red. The further you reach to the center of the
flame, the lower the temperature will be. The red portion is around 1070 K
(800 °C).
.



Teacher Demonstration
Leaping candle flame
How do candles work?
Materials:
Candle / Matches or lighter
* Large candles with a
thick wick work best
NOTE: This
demonstration should be performed in a still room (ie fans off, not too much air
flowing)
Instructions:
Light the
candle and discuss ask the class how they think it ‘works’.
Which part
of the candle is the fuel?
What is the
function of the wick?
Is wax
flammable?
Light a match
or lighter and hold it near the candle. Now carefully blow out
the candle
flame with a short puff of air and try not to disturb the trail of
smoke. Gently
bring the lit match to the vapour trail and move it towards the
wick until
the vapour ignites and relights the candle.
Repeat
several times. Discuss the demonstration and ask the class to reassess
their
understanding of the candle.
Safety notes:
• Emphasise
the safety precautions you are taking before performing this demonstration and
insist
that students only
attempt this demonstration under the supervision of an adult
Explanation:
Candles are a
very clever invention. Wax is the fuel but it will only burn as a vapour -
liquid and solid wax will not burn. Lighting a candle melts the solid
wax in and near the wick. Liquid wax is then drawn up into the wick by
capillary action. The heat of the flame vaporises the liquid wax and the vapour
burns providing enough heat to keep the process going at just the right rate.
The wick is
usually made from an absorbent twine. As the wax vaporises, it cools the wick
and prevents it from being completely burnt. Evaporation is a cooling
process, which many animals exploit by sweating.
When sweat
evaporates, the body is cooled slightly (in high humidity, sweat does not
evaporate as
readily and
accumulates on the skin).
The smoke
from an extinguished candle contains unburnt wax vapour (candle fuel) and is
therefore
flammable. If
this vapour trail is ignited, the flame can travel back to the wick and start
the process of
melting,
vaporising and ignition all over again.
Some candles
waste wax by melting it too fast, causing it to drip down the side of the candle
before it
can be burnt.