men of invention and industry- 第14部分

years；　so　as　to　determine　the　best　proportions　of　the　screw；　and

the　proportions　then　ascertained　have　since　been　the　principal

guides　of　engineering　practice。



The　Rattler　was　at　length　tried　in　a　water　tournament　with　the

paddle…steamer　Alecto；　and　signally　defeated　her。　　Francis　Pettit

Smith；　like　Gulliver；　may　be　said　to　have　dragged　the　whole

British　fleet　after　him。　　Were　the　paddle　our　only　means　of

propulsion；　our　whole　naval　force　would　be　reduced　to　a　nullity。　

Hostile　gunners　would　wing　a　paddle…steamer　as　effectuaily　as　a

sportsman　wings　a　bird；　and　all　the　plating　in　the　world　would

render　such　a　ship　a　mere　helpless　log　on　the　water。



The　Admiralty　could　no　longer　defer　the　use　of　this　important

invention。　　Like　all　good　things；　it　made　its　way　slowly　and　by

degrees。　　The　royal　naval　authorities；　who　in　1833　backed　the

side　paddles；　have　since　adopted　the　screw　in　most　of　the

ships…of…war。　　In　all　long　sea…going　voyages；　also；　the　screw　is

now　the　favourite　mode　of　propulsion。　　Screw　ships　of　prodigious

size　are　now　built　and　launched　in　all　the　ship…building　ports　of

Britain；　and　are　sent　out　to　navigate　in　every　part　of　the　world。



The　introduction　of　iron　as　the　material　for　shipbuilding　has

immensely　advanced　the　interests　of　steam　navigation；　as　it

enables　the　builders　to　construct　vessels　of　great　size　with　the

finest　lines；　so　as　to　attain　the　highest　rates　of　speed。



One　might　have　supposed　that　Francis　Pettit　Smith　would　derive

some　substantial　benefit　from　his　invention；　or　at　least　that　the

Ship　Propeller　Company　would　distribute　large　dividends　among

their　proprietors。　　Nothing　of　the　kind。　　Smith　spent　his　money；

his　labour；　and　his　ingenuity　in　conferring　a　great　public

benefit　without　receiving　any　adequate　reward；　and　the　company；

instead　of　distributing　dividends；　lost　about　50；000L。　in

introducing　this　great　invention；　after　which；　in　1856；　the

patent…right　expired。　　Three　hundred　and　twenty…seven　ships　and

vessels　of　all　classes　in　the　Royal　Navy　had　then　been　fitted

with　the　screw　propeller；　and　a　much　larger　number　in　the

merchant　service；　but　since　that　time　the　number　of　screw

propellers　constructed　is　to　be　counted　by　thousands。



In　his　comparatively　impoverished　condition　it　was　found

necessary　to　do　something　for　the　inventor。　　The　Civil　Engineers；

with　Robert　Stephenson；　M。P。；　in　the　chair；　entertained　him　at　a

dinner　and　presented　him　with　a　handsome　salver　and　claret　jug。　

And　that　he　might　have　something　to　put　upon　his　salver　and　into

his　claret　jug；　a　number　of　his　friends　and　admirers　subscribed

over　2000L。　as　a　testimonial。　　The　Government　appointed　him

Curator　of　the　Patent　Museum　at　South　Kensington；　the　Queen

granted　him　a　pension　on　the　Civil　List　for　200L。　a　year；　he　was

raised　to　the　honour　of　knighthood　in　l87l；　and　three　years　later

he　died。



Francis　Pettit　Smith　was　not　a　great　inventor。　　He　had；　like　many

others；　invented　a　screw　propeller。　　But；　while　those　others　had

given　up　the　idea　of　prosecuting　it　to　its　completion；　Smith

stuck　to　his　invention　with　determined　tenacity；　and　never　let　it

go　until　he　had　secured　for　it　a　complete　triumph。　　As　Mr。

Stephenson　observed　at　the　engineer's　meeting：　　〃Mr。　Smith　had

worked　from　a　platform　which　might　have　been　raised　by　others；　as

Watt　had　done；　and　as　other　great　men　had　done；　but　he　had　made　a

stride　in　advance　which　was　almost　tantamount　to　a　new　invention。



It　was　impossible　to　overrate　the　advantages　which　this　and　other

countries　had　derived　from　his　untiring　and　devoted　patience　in

prosecuting　the　invention　to　a　successful　issue。〃　　Baron　Charles

Dupin　compared　the　farmer　Smith　with　the　barber　Arkwright：　〃He

had　the　same　perseverance　and　the　same　indomitable　courage。　

These　two　moral　qualities　enabled　him　to　triumph　over　every

obstacle。〃　　This　was　the　merit　of　〃Screw〃　Smiththat　he　was

determined　to　realize　what　his　predecessors　had　dreamt　of

achieving；　and　he　eventually　accomplished　his　great　purpose。





Footnotes　for　Chapter　II。



＇1＇　In　the　Transactions　of　the　Institution　of　Naval　Architects

for　1860；　it　was　pointed　out　that　the　general　dimensions　and　form

of　bottom　of　this　ship　were　very　similar　to　the　most　famous

line…of…battle　ships　built　down　to　the　end　of　last　century；　some

of　which　were　then　in　existence。



＇2＇　According　to　the　calculation　of　Mr。　Chatfield；　of　Her

Majesty's　dockyard　at　Plymouth；　in　a　paper　read　before　the

British　Association　in　1841　on　shipbuilding。



＇3＇　The　phrase　〃wooden　walls〃　is　derived　from　the　Greek。　　When

the　city　of　Athens　was　once　in　danger　of　being　attacked　and

destroyed；　the　oracle　of　Delphi　was　consulted。　　The　inhabitants

were　told　that　there　was　no　safety　for　them　but　in　their　〃wooden

walls；〃that　is　their　shipping。　　As　they　had　then　a　powerful

fleet；　the　oracle　gave　them　rational　advice；　which　had　the　effect

of　saving　the　Athenian　people。



＇4＇　An　account　of　these　is　given　by　Bennet　Woodcraft　in　his

Sketch　of　the　Origin　and　Progress　of　Steam　Navigation；　London；

1848。



＇5＇　See　Industrial　Biography；　pp。　183…197；



＇6＇　The　story　is　told　in　Scribner's　Monthly　Illustrated　Magazine；

for　April　1879。　　Ericsson's　modest　bill　was　only　15；000　for　two

years'　labour。　　He　was　put　off　from　year　to　year；　and　at　length

the　Government　refused　to　pay　the　amount。　　〃The　American

Government；〃　says　the　editor　of　Scribner；　〃will　not　appropriate

the　money　to　pay　it；　and　that　is　all。　　It　is　said　to　be　the

nature　of　republics　to　be　ungrateful；　but　must　they　also　be

dishonest？〃



＇7＇　Memoirs　of　the　Life　and　Services　of　Rear…Admiral　Sir　William

Symonds；　Kt。；　p。　332。





CHAPTER　III。＇1＇



JOHN　HARRISON：　INVENTOR　OF　THE　MARINE　CHRONOMETER。



No　man　knows　who　invented　the　mariner's　compass；　or　who　first

hollowed　out　a　canoe　from　a　log。　　The　power　to　observe　accurately

the　sun；　moon；　and　planets；　so　as　to　fix　a　vessel's　actual

position　when　far　out　of　sight　of　land；　enabling　long　voyages　to

be　safely　made；　the　marvellous　improvements　in　ship…building；

which　shortened　passages　by　sailing　vessels；　and　vastly　reduced

freights　even　before　steam　gave　an　independent　force　to　the

carriereach　and　all　were　done　by　small　advances；　which　together

contributed　to　the　general　movement　of　mankind。。。。　　Each　owes　all

to　the　others。　　The　forgotten　inventors　live　for　ever　in　the

usefulness　of　the　work　they　have　done　and　the　progress　they　have

striven　for。〃H。　M。　Hyndman。



One　of　the　most　extraordinary　things　connected　with　Applied

Science　is　the　method　by　which　the　Navigator　is　enabled　to　find

the　exact　spot　of　sea　on　which　his　ship　rides。　　There　may　be

nothing　but　water　and　sky　within　his　view；　he　may　be　in　the　midst

of　the　ocean；　or　gradually　nearing　the　land；　the　curvature　of　the

globe　baffles　the　search　of　his　telescope；　but　if　he　have　a

correct　chronometer；　and　can　make　an　astronomical　observation；　he

may　readily　ascertain　his　longitude；　and　know　his　approximate

positionhow　far　he　is　from　home；　as　well　as　from　his　intended

destination。　　He　is　even　enabled；　at　some　special　place；　to　send

down　his　grappling…irons　into　the　sea；　and　pick　up　an　electrical

cable　for　examination　and　repair。



This　is　the　result　of　a　knowledge　of　Practical　Astronomy。　　〃Place

an　astronomer；〃　says　Mr。　Newcomb；　〃on　board　a　ship；　blindfold

him；　carry　him　by　any　route　to　any　ocean　on　the　globe；　whether

under　the　tropics　or　in　one　of　the　frigid　zones；　land　him　on　the

wildest　rock　that　can　be　found；　remove　his　bandage；　and　give　him

a　chronometer　regulated　to　Greenwich　or　Washington　time；　a

transit　instrument　with　the　proper　appliances；　and　the　necessary

books　and　tables；　and　in　a　single　clear　night　he　can　tell　his

position　within　a　hundred　yards　by　observations　of　the　stars。　

This；　from　a　utilitarian　point　of　view；　is　one　of　the　most

important　operations　of　Practical　Astronomy。〃＇2＇



The　Marine　Chronometer　was　the　outcome　of　the　crying　want　of　the

sixteenth　century　for　an　instrument　that　should　assist　the

navigator　to　find　his　longitude　on　the　pathless　ocean。　　Spain　was

then　the　principal　naval　power；　she　was　the　most　potent　monarchy

in　Europe；　and　held　half　America　under　her　sway。　　Philip　III。　

offered　100；000　crowns　for　any　discovery　by　means　of　which　the

longitude　might　be　determined　by　a　better　method　than　by　the　log；

which　was　found　very　defective。　　Holland　next　became　a　great

naval　power；　and　followed　the　example　of　Spain　in　offering　30；000

florins　for　a　similar　discovery。　　But　though　some　efforts　were

made；　nothing　practical　was　done；　principally　through　the

defective　state　of　astronomical　instruments。　　England　succeeded

Spain　and　Holland　as　a　naval　power；　and　when　Charles　II。

established　the　Greenwich　Observatory；　it　was　made　a　special

point　that　Flamsteed；　the　Astronomer…Royal；　should　direct　his

best　energies　to　the　perfecting　of　a　method　for　finding　the

longitude　by　astronomical　observations。　　But　though　Flamsteed；

together　with　Halley　and　Newton；　made　some　progress；　they　were

prevented　from　obtaining　ultimate　success　by　the　want　of

efficient　chronometers　and　the　defective　nature　of　astronomical

instruments。



Nothing　was　done　until　the　reign　of　Queen　Anne；　when　a　petition

was　presented　to　the　Legislature　on　the　25th　of　May；　1714；　by

〃several　captains　of　Her　Majesty's　ships；　merchants　in　London；

and　commanders　of　merchantmen；　in　behalf　of　themselves；　and　of

all　others　concerned　in　the　navigation　of　Great　Britain；〃　setting

forth　the　importance　of　the　accurate　discovery　of　the　longitude；

and　the　inconvenience　and　danger　to　which　ships　were　subjected

from　the　want　of　some　suitable　method　of　discovering　it。　　The

petition　was　referred　to　a　committee；　which　took　evidence　on　the

subject。　　It　appears　that　Sir　Isaac　Newton；　with　his

extraordinary　sagacity；　hit　the　mark　in　his　report。　　〃One　is；〃　he

said；　〃by　a　watch　to　keep　time　e