the life of thomas telford-第57章

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by　a　series　of　locks　from　both　the　eastern　and　western　seas。

The　whole　number　of　these　is　twenty…eight：　the　entrance…lock　at

Clachnaharry；　constructed　on　piles；　at　the　end　of　huge　embankments；

forced　out　into　deep　water；　at　Loch　Beady；　another　at　the　entrance

to　the　capacious　artificial　harbour　above　mentioned；　at　Muirtown；

four　connected　locks　at　the　southern　end　of　this　basin；

a　regulating　lock　a　little　to　the　north　of　Loch　Dochfour；

five　contiguous　locks　at　Fort　Augustus；　at　the　south　end　of　Loch　Ness；

another；　called　the　Kytra　Lock；　about　midway　between　Fort　Angustus

and　Loch　Oich；　a　regulating　lock　at　the　north…east　end　of　Loch　Oich；

two　contiguous　locks　between　Lochs　Oich　and　Lochy；　a　regulating

lock　at　the　south…west　end　of　Loch　Lochy；　next；　the　grand　series　of

locks；　eight　in　number；　called　〃Neptune's　Staircase；〃　at　Bannavie；

within　a　mile　and　a　quarter　of　the　sea；　two　locks；　descending　to

Corpach　basin；　and　lastly；　the　great　entrance　or　sea…lock　at　Corpach。



The　northern　entrance…lock　from　the　sea　at　Loch　Beauly　is　at

Clachnaharry；　near　Inverness。　　The　works　here　were　not　accomplished

without　much　difficulty　as　well　as　labour；　partly　from　the　very

gradual　declivity　of　the　shore；　and　partly　from　the　necessity　of

placing　the　sea…lock　on　absolute　mud；　which　afforded　no　foundation

other　than　what　was　created　by　compression　and　pile…driving。

The　mud　was　forced　down　by　throwing　upon　it　an　immense　load　of　earth

and　stones；　which　was　left　during　twelve　months　to　settle；　after

which　a　shaft　was　sunk　to　a　solid　foundation；　and　the　masonry　of

the　sea…lock　was　then　founded　and　built　therein。



In　the　'Sixteenth　Report　of　the　Commissioners　of　the　Caledonian

Canal；'　the　following　reference　is　made　to　this　important　work；

which　was　finished　in　1812：　〃The　depth　of　the　mud　on　which　it　may

be　said　to　be　artificially　seated　is　not　less　than　60　feet；　so　that

it　cannot　be　deemed　superfluous；　at　the　end　of　seven　years；　to

state　that　no　subsidence　is　discoverable；　and　we　presume　that　the

entire　lock；　as　well　as　every　part　of　it；　may　now　be　deemed　as

immovable；　and　as　little　liable　to　destruction；　as　any　other　large

mass　of　masonry。　　This　was　the　most　remarkable　work　performed　under

the　immediate　care　of　Mr。　Matthew　Davidson；　our　superintendent　at

Clachnaharry；　from　1804　till　the　time　of　his　decease。　　He　was　a　man

perfectly　qualified　for　the　employment　by　inflexible　integrity；

unwearied　industry；　and　zeal　to　a　degree　of　anxiety；　in　all　the

operations　committed　to　his　care。〃*＇1＇



As　may　naturally　be　supposed；　the　execution　of　these　great　works

involved　vast　labour　and　anxiety。　　They　were　designed　with　much

skill；　and　executed　with　equal　ability。　　There　were　lock…gates　to

be　constructed；　principally　of　cast　iron；　sheathed　with　pine

planking。　　　Eight　public　road　bridges　crossed　the　line　of　the

canal；　which　were　made　of　cast　iron；　and　swung　horizontally。

There　were　many　mountain　streams；　swollen　to　torrents　in　winter；

crossing　under　the　canal；　for　which　abundant　water…way　had　to　be

provided；　involving　the　construction　of　numerous　culverts；　tunnels；

and　under…bridges　of　large　dimensions。　　There　were　also　powerful

sluices　to　let　off　the　excess　of　water　sent　down　from　the　adjacent

mountains　into　the　canal　during　winter。　　Three　of　these；　of　great

size；　high　above　the　river　Lochy；　are　constructed　at　a　point　where

the　canal　is　cut　through　the　solid　rock；　and　the　sight　of　the　mass

of　waters　rushing　down　into　the　valley　beneath；　gives　an　impression

of　power　which；　once　seen；　is　never　forgotten。



These　great　works　were　only　brought　to　a　completion　after　the

labours　of　many　years；　during　which　the　difficulties　encountered　in

their　construction　had　swelled　the　cost　of　the　canal　far　beyond　the

original　estimate。　　The　rapid　advances　which　had　taken　place　in　the

interval　in　the　prices　of　labour　and　materials　also　tended　greatly

to　increase　the　expenses；　and；　after　all；　the　canal；　when　completed

and　opened；　was　comparatively　little　used。　　This　was　doubtless

owing；　in　a　great　measure；　to　the　rapid　changes　which　occurred　in

the　system　of　navigation　shortly　after　the　projection　of　the

undertaking。　　For　these　Telford　was　not　responsible。　　He　was　called

upon　to　make　the　canal；　and　he　did　so　in　the　best　manner。

Engineers　are　not　required　to　speculate　as　to　the　commercial　value

of　the　works　they　are　required　to　construct；　and　there　were

circumstances　connected　with　the　scheme　of　the　Caledonian　Canal

which　removed　it　from　the　category　of　mere　commercial　adventures。

It　was　a　Government　project；　and　it　proved　a　failure　as　a　paying

concern。　　Hence　it　formed　a　prominent　topic　for　discussion　in　the

journals　of　the　day；　but　the　attacks　made　upon　the　Government

because　of　their　expenditure　on　the　hapless　undertaking　were

perhaps　more　felt　by　Telford；　who　was　its　engineer；　than　by　all　the

ministers　of　state　conjoined。



〃The　unfortunate　issue　of　this　great　work；〃　writes　the　present

engineer　of　the　canal；　to　whom　we　are　indebted　for　many　of　the

preceding　facts；　〃was　a　grievous　disappointment　to　Mr。　Telford；

and　was　in　fact　the　one　great　bitter　in　his　otherwise　unalloyed　cup

of　happiness　and　prosperity。　　The　undertaking　was　maligned　by

thousands　who　knew　nothing　of　its　character。　　It　became　'a　dog　with

a　bad　name；'　and　all　the　proverbial　consequences　followed。

The　most　absurd　errors　and　misconceptions　were　propagated　respecting

it　from　year　to　year；　and　it　was　impossible　during　Telford's　lifetime

to　stem　the　torrent　of　popular　prejudice　and　objurgation。　　It　must；

however；　be　admitted；　after　a　long　experience；　that　Telford　was

greatly　over…sanguine　in　his　expectations　as　to　the　national　uses

of　the　canal；　and　he　was　doomed　to　suffer　acutely　in　his　personal

feelings；　little　though　he　may　have　been　personally　to　blame；　the

consequences　of　what　in　this　commercial　country　is　regarded　as　so

much　worse　than　a　crime；　namely；　a　financial　mistake。〃*＇2＇



Mr。　Telford's　great　sensitiveness　made　him　feel　the　ill　success　of

this　enterprise　far　more　than　most　other　men　would　have　done。

He　was　accustomed　to　throw　himself　into　the　projects　on　which　he

was　employed　with　an　enthusiasm　almost　poetic。　　He　regarded　them

not　merely　as　so　much　engineering；　but　as　works　which　were　to　be

instrumental　in　opening　up　the　communications　of　the　country　and

extending　its　civilization。　　Viewed　in　this　light；　his　canals；

roads；　bridges；　and　harbours　were　unquestionably　of　great　national

importance；　though　their　commercial　results　might　not　in　all　cases

justify　the　estimates　of　their　projectors。　　To　refer　to　like

instancesno　one　can　doubt　the　immense　value　and　public　uses　of

Mr。　Rennie's　Waterloo　Bridge　or　Mr。　Robert　Stephenson's　Britannia

and　Victoria　Bridges；　though　every　one　knows　that；　commercially；

they　have　been　failures。　　But　it　is　probable　that　neither　of　these

eminent　engineers　gave　himself　anything　like　the　anxious　concern

that　Telford　did　about　the　financial　issue　of　his　undertaking。

Were　railway　engineers　to　fret　and　vex　themselves　about　the　commercial

value　of　the　schemes　in　which　they　have　been　engaged；　there　are　few

of　them　but　would　be　so　haunted　by　the　ghosts　of　wrecked　speculations

that　they　could　scarcely　lay　their　heads　upon　their　pillows　for　a

single　night　in　peace。



While　the　Caledonian　Canal　was　in　progress；　Mr。　Telford　was

occupied　in　various　works　of　a　similar　kind　in　England　and　Scotland；

and　also　upon　one　in　Sweden。　　In　1804；　while　on　one　of　his　journeys

to　the　north；　he　was　requested　by　the　Earl　of　Eglinton　and　others

to　examine　a　project　for　making　a　canal　from　Glasgow　to　Saltcoats

and　Ardrossan；　on　the　north…western　coast　of　the　county　of　Ayr；

passing　near　the　important　manufacturing　town　of　Paisley。　　A　new

survey　of　the　line　was　made；　and　the　works　were　carried　on　during

several　successive　years　until　a　very　fine　capacious　canal　was

completed；　on　the　same　level；　as　far　as　Paisley　and　Johnstown。

But　the　funds