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A sparka flint How fire leapt to lift (ver.3)

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2021-02-28 18:26
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2021年2月28日发(作者:sads)


Passage One:



A spark, a flint: How fire leapt to life



The control of fire was the first and perhaps greatest of humanity’


s steps towards a


life-enhancing technology



To early man, fire was a divine gift randomly delivered in the form of lightning, forest


fire


or


burning


lava.


Unable


to


make


flame


for


themselves,


the


earliest


peoples


probably stored fire by


keeping slow


burning logs alight


or by


carrying


charcoal


in


pots.



How and where man learnt how to produce flame at will is unknown. It was probably


a secondary invention, accidentally made during tool-making operations with wood or


stone.


Studies


of


primitive


societies


suggest


that


the


earliest


method


of


making


fire


was through friction. European peasants would insert a wooden drill in a round hole


and


rotate


it


briskly


between


their


palms.


This


process


could


be


speeded


up


by


wrapping a cord around the drill and pulling on each end.



The Ancient Greeks used lenses or concave mirrors to


concentrate the sun’s rays and


burning glasses were also used by Mexican Aztecs and the Chinese.



Percussion methods of firelighting date back to


Paleolithic times, when some Stone


Age


tool-makers


discovered


that


chipping


flints


produced


sparks.


The


technique


became


more


efficient


after


the


discovery


of


iron,


about


5000


years


ago


In


Arctic


North America, the Eskimos produced a slow-burning spark by striking quartz against


iron pyrites, a compound that contains sulphur. The Chinese lit their fires by striking


porcelain with bamboo. In Europe, the combination of steel, flint and tinder remained


the main method of firelighting until the mid 19th century.



Fire-lighting was revolutionised by the discovery of phosphorus, isolated in 1669 by a


German


alchemist


try


ing


to


transmute


silver


into


gold.


Impressed


by


the


element’s


combustibility,


several


17th


century


chemists


used


it


to


manufacture


fire-lighting


devices, but the results were dangerously inflammable. With phosphorus costing the


equivalent of several hundred pounds per ounce, the first matches were expensive.



The


quest


for


a


practical


match


really


began


after


1781


when


a


group


of


French


chemists came up with the


Phosphoric Candle


or


Ethereal Match


, a sealed glass tube


containing


a twist of paper tipped with phosphorus. When the tube was


broken, air


rushed in, causing the phosphorus to self-combust. An even more hazardous device,


popular in America, was the


Instantaneous Light Box



a bottle filled with sulphuric


acid into which splints treated with chemicals were dipped.



The first matches resembling those used today were made in 1827 by John Walker, an


English


pharmacist


who


borrowed


the


formula


from


a


military


rocket-maker


called


Congreve. Costing a shilling a box, Congreves were splints coated with sulphur and


tipped


with


potassium


chlorate.


To


light


them,


the


user


drew


them


quickly


through


folded glass paper.



Walker never patented his invention, and three years later it was copied by a Samuel


Jones,


who


marketed


his


product


as


Lucifers


.


About


the


same


time,


a


French


chemistry


student


called


Charles


Sauria


produced


the


first


“strike


-


anywhere”


match


by


substituting


white


phosphorus


for


the


potassium


chlorate


in


the


Walker


formula.


However,


since


white


phosphorus


is


a


deadly


poison,


from


1845


match-makers


exposed


to


its


fumes


succumbed


to


necrosis,


a


disease


that


eats


away


jaw-bones.


It


wasn’t until 1906 that the substance was eventually banned.




That was 62 years after a Swedish chemist called Pasch had discovered non- toxic red


or


amorphous


phosphorus,


a


development


exploited


commercially


by


Pasch’s


compatriot J E Lundstrom in 1885. Lundstrom’s safety matches were safe because the


red phosphorus was non-toxic; it was painted on to the striking surface instead of the


match


tip,


which


contained


potassium


chlorate


with


a


relatively


high


ignition


temperature of 182 degrees centigrade.



America lagged behind


Europe in


match technology


and safety standards.


It wasn’t


until


1900


that


the


Diamond


Match


Company


bought


a


French


patent


for


safety


matches



but the formula did not work properly in the different climatic conditions


prevailing in America and it was another 11 years before scientists finally adapted the


French patent for the US.



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