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С˵£º industrial biography ×ÖÊý£º ÿҳ3500×Ö

°´¼üÅÌÉÏ·½Ïò¼ü ¡û »ò ¡ú ¿É¿ìËÙÉÏÏ·­Ò³£¬°´¼üÅÌÉ쵀 Enter ¼ü¿É»Øµ½±¾ÊéĿ¼ҳ£¬°´¼üÅÌÉÏ·½Ïò¼ü ¡ü ¿É»Øµ½±¾Ò³¶¥²¿£¡
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it£»¡¡some¡¡ingenious¡¡person¡¡suggested¡¡that¡¡a¡¡number¡¡of¡¡saws¡¡should¡¡be

fixed¡¡to¡¡a¡¡frame¡¡in¡¡a¡¡mill£»¡¡so¡¡contrived¡¡as¡¡to¡¡work¡¡with¡¡a

reciprocating¡¡motion£»¡¡upwards¡¡and¡¡downwards£»¡¡or¡¡backwards¡¡and

forwards£»¡¡and¡¡that¡¡this¡¡frame¡¡so¡¡mounted¡¡should¡¡be¡¡yoked¡¡to¡¡the¡¡mill

wheel£»¡¡and¡¡the¡¡saws¡¡driven¡¡by¡¡the¡¡power¡¡of¡¡wind¡¡or¡¡water¡£¡¡¡¡The¡¡plan

was¡¡tried£»¡¡and£»¡¡as¡¡may¡¡readily¡¡be¡¡imagined£»¡¡the¡¡amount¡¡of¡¡effective

work¡¡done¡¡by¡¡this¡¡machine¡­saw¡¡was¡¡immense£»¡¡compared¡¡with¡¡the¡¡tedious

process¡¡of¡¡sawing¡¡by¡¡hand¡£



It¡¡will¡¡be¡¡observed£»¡¡however£»¡¡that¡¡the¡¡new¡¡method¡¡must¡¡have¡¡seriously

interfered¡¡with¡¡the¡¡labour¡¡of¡¡the¡¡hand¡­sawyers£»¡¡and¡¡it¡¡was¡¡but

natural¡¡that¡¡they¡¡should¡¡regard¡¡the¡¡establishment¡¡of¡¡the¡¡saw¡­mills

with¡¡suspicion¡¡and¡¡hostility¡£¡¡¡¡Hence¡¡a¡¡long¡¡period¡¡elapsed¡¡before¡¡the

hand¡­sawyers¡¡would¡¡permit¡¡the¡¡new¡¡machinery¡¡to¡¡be¡¡set¡¡up¡¡and¡¡worked¡£

The¡¡first¡¡saw¡­mill¡¡in¡¡England¡¡was¡¡erected¡¡by¡¡a¡¡Dutchman£»¡¡near¡¡London£»

in¡¡1663£»¡¡but¡¡was¡¡shortly¡¡abandoned¡¡in¡¡consequence¡¡of¡¡the¡¡determined

hostility¡¡of¡¡the¡¡workmen¡£¡¡¡¡More¡¡than¡¡a¡¡century¡¡passed¡¡before¡¡a¡¡second

saw¡­mill¡¡was¡¡set¡¡up£»¡¡when£»¡¡in¡¡1767£»¡¡Mr¡£¡¡John¡¡Houghton£»¡¡a¡¡London

timber¡­merchant£»¡¡by¡¡the¡¡desire¡¡and¡¡with¡¡the¡¡approbation¡¡of¡¡the

Society¡¡of¡¡Arts£»¡¡erected¡¡one¡¡at¡¡Limehouse£»¡¡to¡¡be¡¡driven¡¡by¡¡wind¡£¡¡¡¡The

work¡¡was¡¡directed¡¡by¡¡one¡¡James¡¡Stansfield£»¡¡who¡¡had¡¡gone¡¡over¡¡to

Holland¡¡for¡¡the¡¡purpose¡¡of¡¡learning¡¡the¡¡art¡¡of¡¡constructing¡¡and

managing¡¡the¡¡sawing¡¡machinery¡£¡¡¡¡But¡¡the¡¡mill¡¡was¡¡no¡¡sooner¡¡erected

than¡¡a¡¡mob¡¡assembled¡¡and¡¡razed¡¡it¡¡to¡¡the¡¡ground¡£¡¡¡¡The¡¡principal

rioters¡¡having¡¡been¡¡punished£»¡¡and¡¡the¡¡loss¡¡to¡¡the¡¡proprietor¡¡having

been¡¡made¡¡good¡¡by¡¡the¡¡nation£»¡¡a¡¡new¡¡mill¡¡was¡¡shortly¡¡after¡¡built£»¡¡and

it¡¡was¡¡suffered¡¡to¡¡work¡¡without¡¡further¡¡molestation¡£



Improved¡¡methods¡¡of¡¡manufacture¡¡have¡¡usually¡¡had¡¡to¡¡encounter¡¡the

same¡¡kind¡¡of¡¡opposition¡£¡¡¡¡Thus£»¡¡when¡¡the¡¡Flemish¡¡weavers¡¡came¡¡over¡¡to

England¡¡in¡¡the¡¡seventeenth¡¡century£»¡¡bringing¡¡with¡¡them¡¡their¡¡skill

and¡¡their¡¡industry£»¡¡they¡¡excited¡¡great¡¡jealousy¡¡and¡¡hostility¡¡amongst

the¡¡native¡¡workmen¡£¡¡¡¡Their¡¡competition¡¡as¡¡workmen¡¡was¡¡resented¡¡as¡¡an

injury£»¡¡but¡¡their¡¡improved¡¡machinery¡¡was¡¡regarded¡¡as¡¡a¡¡far¡¡greater

source¡¡of¡¡mischief¡£¡¡¡¡In¡¡a¡¡memorial¡¡presented¡¡to¡¡the¡¡king¡¡in¡¡1621¡¡we

find¡¡the¡¡London¡¡weavers¡¡complaining¡¡of¡¡the¡¡foreigners'¡¡competition£»

but¡¡especially¡¡that¡¡¡¨they¡¡have¡¡made¡¡so¡¡bould¡¡of¡¡late¡¡as¡¡to¡¡devise

engines¡¡for¡¡working¡¡of¡¡tape£»¡¡lace£»¡¡ribbin£»¡¡and¡¡such¡¡like£»¡¡wherein¡¡one

man¡¡doth¡¡more¡¡among¡¡them¡¡than¡¡7¡¡Englishe¡¡men¡¡can¡¡doe£»¡¡so¡¡as¡¡their

cheap¡¡sale¡¡of¡¡commodities¡¡beggereth¡¡all¡¡our¡¡Englishe¡¡artificers¡¡of

that¡¡trade£»¡¡and¡¡enricheth¡¡them¡£¡¨*

¡¡£§footnote¡£¡£¡£

State¡¡Papers£»¡¡Dom¡£¡¡1621£»¡¡Vol¡£¡¡88£»¡¡No¡£¡¡112¡£

¡¡¡£¡£¡££§



At¡¡a¡¡much¡¡more¡¡recent¡¡period¡¡new¡¡inventions¡¡have¡¡had¡¡to¡¡encounter

serious¡¡rioting¡¡and¡¡machine¡­breaking¡¡fury¡£¡¡¡¡Kay¡¡of¡¡the¡¡fly¡­shuttle£»

Hargreaves¡¡of¡¡the¡¡spinning¡­jenny£»¡¡and¡¡Arkwright¡¡of¡¡the

spinning¡­frame£»¡¡all¡¡had¡¡to¡¡fly¡¡from¡¡Lancashire£»¡¡glad¡¡to¡¡escape¡¡with

their¡¡lives¡£¡¡¡¡Indeed£»¡¡says¡¡Mr¡£¡¡Bazley£»¡¡¡¨so¡¡jealous¡¡were¡¡the¡¡people£»

and¡¡also¡¡the¡¡legislature£»¡¡of¡¡everything¡¡calculated¡¡to¡¡supersede¡¡men's

labour£»¡¡that¡¡when¡¡the¡¡Sankey¡¡Canal£»¡¡six¡¡miles¡¡long£»¡¡near¡¡Warrington£»

was¡¡authorized¡¡about¡¡the¡¡middle¡¡of¡¡last¡¡century£»¡¡it¡¡was¡¡on¡¡the

express¡¡condition¡¡that¡¡the¡¡boats¡¡plying¡¡on¡¡it¡¡should¡¡be¡¡drawn¡¡by¡¡men

only£¡¡¨*

¡¡£§footnote¡£¡£¡£

Lectures¡¡on¡¡the¡¡Results¡¡of¡¡the¡¡Great¡¡Exhibition¡¡of¡¡1851£»¡¡2nd¡¡Series£»

117¡£

¡¡¡£¡£¡££§

Even¡¡improved¡¡agricultural¡¡tools¡¡and¡¡machines¡¡have¡¡had¡¡the¡¡same

opposition¡¡to¡¡encounter£»¡¡and¡¡in¡¡our¡¡own¡¡time¡¡bands¡¡of¡¡rural¡¡labourers

have¡¡gone¡¡from¡¡farm¡¡to¡¡farm¡¡breaking¡¡drill¡­ploughs£»¡¡winnowing£»

threshing£»¡¡and¡¡other¡¡machines£»¡¡down¡¡even¡¡to¡¡the¡¡common¡¡drills£»not

perceiving¡¡that¡¡if¡¡their¡¡policy¡¡had¡¡proved¡¡successful£»¡¡and¡¡tools

could¡¡have¡¡been¡¡effectually¡¡destroyed£»¡¡the¡¡human¡¡race¡¡would¡¡at¡¡once

have¡¡been¡¡reduced¡¡to¡¡their¡¡teeth¡¡and¡¡nails£»¡¡and¡¡civilization

summarily¡¡abolished¡£*

¡¡£§footnote¡£¡£¡£

Dr¡£¡¡Kirwan£»¡¡late¡¡President¡¡of¡¡the¡¡Royal¡¡Irish¡¡Academy£»¡¡who¡¡had

travelled¡¡much¡¡on¡¡the¡¡continent¡¡of¡¡Europe£»¡¡used¡¡to¡¡relate£»¡¡when

speaking¡¡of¡¡the¡¡difficulty¡¡of¡¡introducing¡¡improvements¡¡in¡¡the¡¡arts

and¡¡manufactures£»¡¡and¡¡of¡¡the¡¡prejudices¡¡entertained¡¡for¡¡old

practices£»¡¡that£»¡¡in¡¡Normandy£»¡¡the¡¡farmers¡¡had¡¡been¡¡so¡¡long¡¡accustomed

to¡¡the¡¡use¡¡of¡¡plough's¡¡whose¡¡shares¡¡were¡¡made¡¡entirely¡¡of¡¡WOOD¡¡that

they¡¡could¡¡not¡¡be¡¡prevailed¡¡on¡¡to¡¡make¡¡trial¡¡of¡¡those¡¡with¡¡IRON£»¡¡that

they¡¡considered¡¡them¡¡to¡¡be¡¡an¡¡idle¡¡and¡¡useless¡¡innovation¡¡on¡¡the

long¡­established¡¡practices¡¡of¡¡their¡¡ancestors£»¡¡and¡¡that¡¡they¡¡carried

these¡¡prejudices¡¡so¡¡far¡¡as¡¡to¡¡force¡¡the¡¡government¡¡to¡¡issue¡¡an¡¡edict

on¡¡the¡¡subject¡£¡¡¡¡And¡¡even¡¡to¡¡the¡¡last¡¡they¡¡were¡¡so¡¡obstinate¡¡in¡¡their

attachment¡¡to¡¡ploughshares¡¡of¡¡wood¡¡that¡¡a¡¡tumultuous¡¡opposition¡¡was

made¡¡to¡¡the¡¡enforcement¡¡of¡¡the¡¡edict£»¡¡which¡¡for¡¡a¡¡short¡¡time

threatened¡¡a¡¡rebellion¡¡in¡¡the¡¡province¡£¡¡PARKES£»¡¡Chemical¡¡Essays£»

4th¡¡Ed¡£¡¡473¡£

¡¡¡£¡£¡££§



It¡¡is£»¡¡no¡¡doubt£»¡¡natural¡¡that¡¡the¡¡ordinary¡¡class¡¡of¡¡workmen¡¡should

regard¡¡with¡¡prejudice£»¡¡if¡¡not¡¡with¡¡hostility£»¡¡the¡¡introduction¡¡of

machines¡¡calculated¡¡to¡¡place¡¡them¡¡at¡¡a¡¡disadvantage¡¡and¡¡to¡¡interfere

with¡¡their¡¡usual¡¡employments£»¡¡for¡¡to¡¡poor¡¡and¡¡not¡¡very¡¡far¡­seeing¡¡men

the¡¡loss¡¡of¡¡daily¡¡bread¡¡is¡¡an¡¡appalling¡¡prospect¡£¡¡¡¡But¡¡invention¡¡does

not¡¡stand¡¡still¡¡on¡¡that¡¡account¡£¡¡¡¡Human¡¡brains¡¡WILL¡¡work¡£¡¡¡¡Old¡¡tools

are¡¡improved¡¡and¡¡new¡¡ones¡¡invented£»¡¡superseding¡¡existing¡¡methods¡¡of

production£»¡¡though¡¡the¡¡weak¡¡and¡¡unskilled¡¡may¡¡occasionally¡¡be¡¡pushed

aside¡¡or¡¡even¡¡trodden¡¡under¡¡foot¡£¡¡¡¡The¡¡consolation¡¡which¡¡remains¡¡is£»

that¡¡while¡¡the¡¡few¡¡suffer£»¡¡society¡¡as¡¡a¡¡whole¡¡is¡¡vastly¡¡benefitted¡¡by

the¡¡improved¡¡methods¡¡of¡¡production¡¡which¡¡are¡¡suggested£»¡¡invented£»¡¡and

perfected¡¡by¡¡the¡¡experience¡¡of¡¡successive¡¡generations¡£



The¡¡living¡¡race¡¡is¡¡the¡¡inheritor¡¡of¡¡the¡¡industry¡¡and¡¡skill¡¡of¡¡all

past¡¡times£»¡¡and¡¡the¡¡civilization¡¡we¡¡enjoy¡¡is¡¡but¡¡the¡¡sum¡¡of¡¡the

useful¡¡effects¡¡of¡¡labour¡¡during¡¡the¡¡past¡¡centuries¡£¡¡¡¡Nihil¡¡per¡¡saltum¡£

By¡¡slow¡¡and¡¡often¡¡painful¡¡steps¡¡Nature's¡¡secrets¡¡have¡¡been¡¡mastered¡£

Not¡¡an¡¡effort¡¡has¡¡been¡¡made¡¡but¡¡has¡¡had¡¡its¡¡influence¡£¡¡¡¡For¡¡no¡¡human

labour¡¡is¡¡altogether¡¡lost£»¡¡some¡¡remnant¡¡of¡¡useful¡¡effect¡¡surviving

for¡¡the¡¡benefit¡¡of¡¡the¡¡race£»¡¡if¡¡not¡¡of¡¡the¡¡individual¡£¡¡¡¡Even¡¡attempts

apparently¡¡useless¡¡have¡¡not¡¡really¡¡been¡¡so£»¡¡but¡¡have¡¡served¡¡in¡¡some

way¡¡to¡¡advance¡¡man¡¡to¡¡higher¡¡knowledge£»¡¡skill£»¡¡or¡¡discipline¡£¡¡¡¡¡¨The

loss¡¡of¡¡a¡¡position¡¡gained£»¡¨¡¡says¡¡Professor¡¡Thomson£»¡¡¡¨is¡¡an¡¡event

unknown¡¡in¡¡the¡¡history¡¡of¡¡man's¡¡struggle¡¡with¡¡the¡¡forces¡¡of¡¡inanimate

nature¡£¡¨¡¡¡¡A¡¡single¡¡step¡¡won¡¡gives¡¡a¡¡firmer¡¡foothold¡¡for¡¡further

effort¡£¡¡¡¡The¡¡man¡¡may¡¡die£»¡¡but¡¡the¡¡race¡¡survives¡¡and¡¡continues¡¡the

work£»to¡¡use¡¡the¡¡poet's¡¡simile£»¡¡mounting¡¡on¡¡stepping¡­stones¡¡of¡¡dead

selves¡¡to¡¡higher¡¡selves¡£



Philarete¡¡Chasles£»¡¡indeed£»¡¡holds¡¡that¡¡it¡¡is¡¡the¡¡Human¡¡Race¡¡that¡¡is

your¡¡true¡¡inventor£º¡¡¡¡¡¨As¡¡if¡¡to¡¡unite¡¡all¡¡generations£»¡¨¡¡he¡¡says£»¡¡¡¨and

to¡¡show¡¡that¡¡man¡¡can¡¡only¡¡act¡¡efficiently¡¡by¡¡association¡¡with¡¡others£»

it¡¡has¡¡been¡¡ordained¡¡that¡¡each¡¡inventor¡¡shall¡¡only¡¡interpret¡¡the

first¡¡word¡¡of¡¡the¡¡problem¡¡he¡¡sets¡¡himself¡¡to¡¡solve£»¡¡and¡¡that¡¡every

great¡¡idea¡¡shall¡¡be¡¡the¡¡RESUME¡¡of¡¡the¡¡past¡¡at¡¡the¡¡same¡¡time¡¡that¡¡it

is¡¡the¡¡germ¡¡of¡¡the¡¡future¡£¡¨¡¡¡¡And¡¡rarely¡¡does¡¡it¡¡happen¡¡that¡¡any

discovery¡¡or¡¡invention¡¡of¡¡importance¡¡is¡¡made¡¡by¡¡one¡¡man¡¡alone¡£¡¡¡¡The

threads¡¡of¡¡inquiry¡¡are¡¡taken¡¡up¡¡and¡¡traced£»¡¡one¡¡labourer¡¡succeeding

another£»¡¡each¡¡tracing¡¡it¡¡a¡¡little¡¡further£»¡¡often¡¡without¡¡apparent

result¡£¡¡¡¡This¡¡goes¡¡on¡¡sometimes¡¡for¡¡centuries£»¡¡until¡¡at¡¡length¡¡some

man£»¡¡greater¡¡perhaps¡¡than¡¡his¡¡fellows£»¡¡seeking¡¡to¡¡fulfil¡¡the¡¡needs¡¡of

his¡¡time£»¡¡gathers¡¡the¡¡various¡¡threads¡¡together£»¡¡treasures¡¡up¡¡the¡¡gain

of¡¡past¡¡successes¡¡and¡¡failures£»¡¡and¡¡uses¡¡them¡¡as¡¡the¡¡means¡¡for¡¡some

solid¡¡achievement£»¡¡Thus¡¡Newton¡¡discovered¡¡the¡¡law¡¡of¡¡gravitation£»¡¡and

thus¡¡James¡¡Watt¡¡invented¡¡the¡¡steam¡­engine¡£¡¡¡¡So¡¡also¡¡of¡¡the¡¡Locomotive£»

of¡¡which¡¡Robert¡¡Stephenson¡¡said£»¡¡¡¨It¡¡has¡¡not¡¡been¡¡the¡¡invention¡¡of

any¡¡one¡¡man£»¡¡but¡¡of¡¡a¡¡race¡¡of¡¡mechanical¡¡engineers¡£¡¨¡¡¡¡Or£»¡¡as¡¡Joseph

Bramah¡¡observed£»¡¡in¡¡the¡¡preamble¡¡to¡¡his¡¡second¡¡Lock¡¡patent£»¡¡¡¨Among

the¡¡number¡¡of¡¡patents¡¡granted¡¡there¡¡are¡¡comparatively¡¡few¡¡which¡¡can

be¡¡called¡¡original¡¡so¡¡that¡¡it¡¡is¡¡difficult¡¡to¡¡say¡¡where¡¡the¡¡boundary

of¡¡one¡¡ends¡¡and¡¡where¡¡that¡¡of¡¡another¡¡begins¡£¡¨



The¡¡arts¡¡are¡¡indeed¡¡reared¡¡but¡¡slowly£»¡¡and¡¡it¡¡was¡¡a¡¡wise¡¡observation

of¡¡Lord¡¡Bacon¡¡that¡¡we¡¡are¡¡too¡¡apt¡¡to¡¡pass¡¡those¡¡ladders¡¡by¡¡which¡¡they

have¡¡been¡¡reared£»¡¡and¡¡reflect¡¡the¡¡whole¡¡merit¡¡on¡¡the¡¡last¡¡new

performer¡£¡¡¡¡Thus£»¡¡what¡¡is¡¡hailed¡¡as¡¡an¡¡original¡¡invention¡¡is¡¡often

found¡¡to¡¡be¡¡but¡¡the¡¡result¡¡of¡¡a¡¡long¡¡succession¡¡of¡¡trials¡¡and

experiments¡¡gradually¡¡following¡¡each¡¡other£»¡¡which¡¡ought¡¡rather¡¡to¡¡be

considered¡¡as¡¡a¡¡continuous¡¡series¡¡of¡¡achievements¡¡of¡¡the¡¡human¡¡mind

than¡¡as¡¡the¡¡conquest¡¡of¡¡any¡¡single¡¡individual¡£¡¡¡¡It¡¡has¡¡sometimes¡¡taken

centuries¡¡of¡¡experience¡¡to¡¡ascertain¡¡the¡¡value¡¡of¡¡a¡¡single¡¡fact¡¡in

its¡¡various¡¡bearings¡£¡¡¡¡Like¡¡man¡¡himself£»¡¡experience¡¡is¡¡feeble¡¡and

apparently¡¡purposeless¡¡in¡¡its¡¡infancy£»¡¡but¡¡acquires¡¡maturity¡¡and

strength¡¡with¡¡age¡£¡¡¡¡Experience£»¡¡however£»¡¡is¡¡not¡¡limited¡¡to¡¡a¡¡lifetime£»

but¡¡is¡¡the¡¡stored¡­up¡¡wealth¡¡and¡¡power¡¡of¡¡our¡¡race¡£¡¡¡¡Even¡¡amidst¡¡the

death¡¡of¡¡successive¡¡generations¡¡it¡¡is¡¡constantly¡¡advancing¡¡and

accumulating£»¡¡exhibiting¡¡at¡¡the¡¡same¡¡time¡¡the¡¡weakness¡¡and¡¡the¡¡power£»

the¡¡littleness¡¡and¡¡the¡¡greatness¡¡of¡¡our¡¡common¡¡humanity¡£¡¡¡¡And¡¡not¡¡only

do¡¡we¡¡who¡¡live¡¡succeed¡¡to¡¡the¡¡actual¡¡results¡¡of¡¡our¡¡predecessors'

labours£»to¡¡their¡¡works¡¡of¡¡learning¡¡and¡¡of¡¡art£»¡¡their¡¡inventions¡¡and

discoveries£»¡¡their¡¡tools¡¡and¡¡machines£»¡¡their¡¡roads£»¡¡bridges¡¡£»¡¡canals£»

and¡¡railways£»but¡¡to¡¡the¡¡inborn¡¡aptitudes¡¡of¡¡blood¡¡and¡¡brain¡¡which

they¡¡bequeath¡¡to¡¡us£»¡¡to¡¡that¡¡¡¨educability£»¡¨¡¡so¡¡to¡¡speak£»¡¡which¡¡has

been¡¡won¡¡for¡¡us¡¡by¡¡the¡¡labours¡¡of¡¡many¡¡generations£»¡¡and¡¡forms¡¡our

richest¡¡natural¡¡heritage¡£



The¡¡beginning¡¡of¡¡most¡¡inventions¡¡is¡¡very¡¡remote¡£¡¡¡¡The¡¡first¡¡idea£»¡¡born

within¡¡some¡¡unknown¡¡brain£»¡¡passes¡¡thence¡¡into¡¡others£»¡¡and¡¡at¡¡last

comes¡¡forth¡¡complete£»¡¡after¡¡a¡¡parturition£»¡¡it¡¡may¡¡be£»¡¡of¡¡centuries¡£

One¡¡starts¡¡the¡¡idea£»¡¡another¡¡developes¡¡it£»¡¡and¡¡so¡¡on¡¡progressively

until¡¡at¡¡last¡¡it¡¡is¡¡elaborated¡¡and¡¡worked¡¡out¡¡in¡¡practice£»¡¡but¡¡the

first¡¡not¡¡less¡¡than¡¡the¡¡last¡¡is¡¡entitled¡¡to¡¡his¡¡share¡¡in¡¡the¡¡merit¡¡of

the¡¡invention£»¡¡were¡¡it¡¡only¡¡possible¡¡to¡¡measure¡¡and¡¡apportion¡¡it

duly¡£¡¡¡¡Sometimes¡¡a¡¡great¡¡original¡¡mind¡¡strikes¡¡upon¡¡some¡¡new¡¡vein¡¡of

hidden¡¡power£»¡¡and¡¡gives¡¡a¡¡powerful¡¡impulse¡¡to¡¡the¡¡inventive¡¡faculties

of¡¡man£»¡¡which¡¡lasts¡¡through¡¡generations¡£¡¡¡¡More¡¡frequently£»¡¡however£»

inventions¡¡are¡¡not¡¡entirely¡¡new£»¡¡but¡¡modifications¡¡of¡¡contrivances

previously¡¡known£»¡¡though¡¡to¡¡a¡¡few£»¡¡and¡¡not¡¡yet¡¡brought¡¡into¡¡practical

use¡£¡¡¡¡Glancing¡¡back¡¡over¡¡the¡¡history¡¡of¡¡mechanism£»¡¡we¡¡occasionally¡¡see

an¡¡invention¡¡seemingly¡¡full¡¡born£»¡¡when¡¡suddenly¡¡it¡¡drops¡¡out¡¡of

sight£»¡¡and¡¡we¡¡hear¡¡no¡¡more¡¡of¡¡it¡¡for¡¡centuries¡£¡¡¡¡It¡¡is¡¡taken¡¡up¡¡de

novo¡¡by¡¡some¡¡inventor£»¡¡stimulated¡¡by¡¡the¡¡needs¡¡of¡¡his¡¡time£»¡¡and

falling¡¡again¡¡upon¡¡the¡¡track£»¡¡he¡¡recovers¡¡the¡¡old¡¡footmarks£»¡¡follows

them¡¡up£»¡¡and¡¡completes¡¡the¡¡work¡£



There¡¡is¡¡also¡¡such¡¡a¡¡thing¡¡as¡¡inventions¡¡being¡¡born¡¡before¡¡their¡¡time

the¡¡advanced¡¡mind¡¡of¡¡one¡¡generation¡¡projecting¡¡that¡¡whic

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