AsMr。CadwalladrDaviesobservedatthebanquet,whichtookplaceonthefollowingday:“TheestablishmentofthenewinstitutionwillmarkthedawnofanewerainthehistoryoftheWelshpeople。Helookedtoit,notonlyasameansofimpartingacademicalknowledgetothestudentswithinitswalls,butalsoasameansofraisingtheintellectualandmoraltoneofthewholepeople。TheywerefondofquotingthesayingofagreatEnglishwriter,thattherewassomethingGrecianintheCelticrace,andthattheCelticwastherefiningelementintheBritishcharacter;butsuchremarks,oftenaccompaniedastheywerewithoffensivecomparisonsfromEisteddfodplatforms,wouldinfuturebeputtothetest,fortheywould,withtheirneweducationalmachinery,beplacedonafootingofperfectequalitywiththeScotchandtheIrishpeople。“
AndheremustcometoanendthecharacterhistoryofmyautumntourinIreland,Scotland,Yorkshire,andWales。Ihadnottheremotestintentionwhensettingoutofcollectinginformationandwritingdownmyrecollectionsofthejourney。ButthepersonsI
met,andtheinformationIreceived,wereofnosmallinterest——atleasttomyself;andItrustthatthereaderwillderiveasmuchpleasurefromperusingmyobservationsasIhavehadincollectingandwritingthemdown。IdothinkthattheremarkablepersonswhosehistoryandcharactersIhaveendeavoured,howeverbriefly,tosketch,willbefoundtoaffordmanyvaluableandimportantlessonsofSelf-Help;andtoillustratehowthemoralandindustrialfoundationsofacountrymaybebuiltupandestablished。
FootnotesforChapterXII。
[1]A“poet,“whodatesfrom“NewYork,March1883,“haspublishedsevenstanzas,entitled“ChangehereforBlairgowrie,“
fromwhichwetakethefollowing:——
“Fromearlymorntilllateate’en,John’shonestfaceistobeseen,Bustlingaboutthetrainsbetween,Be’tsunshineorbe’tshowery;
Andaseachonestopsathisdoor,Hegreetsitwiththewell-knownroarOf’ChangehereforBlairgowrie。’
EvenwhenthestillanddrowsynightHasdrawnthecurtainsofoursight,John’swatchfuleyesbecomemorebright,Andtakeanotherglow’rayeThro’yonbluedomeofsparklingstarsWhereVenusbrightandruddyMarsShinedownuponBlairgowrie。
Hekenseachjinkin’comet’strack,Andwhenit’slikelytocomeback,Whentheyhavetails,andwhentheylack——
Inheaventhewaggishpoweraye;
WhenJupiter’sbeltbucklehings,AndthePyxmarkonSaturn’srings,HeseesfromnearBlairgowrie。“
TheObservatory,No。61,p。146;andNo。68,p。371。
InanarticleonthesubjectintheDundeeEveningTelegraph,Mr。Robertsonobserves:“Ifourfinitemindsweremorecapableofcomprehension,whatagloriousviewofthegrandeuroftheDeitywouldbedisplayedtousinthecontemplationofthecentreandsourceoflightandheattothesolarsystem。Theforcerequisitetopoursuchcontinuousfloodstotheremotestpartsofthesystemmusteverbafflethemindofmantograsp。Butwearenottositdowninindolence:ourdutyistoinquireintoNature’sworks,thoughwecanneverexhaustthefield。OurmindscannotimaginemotionwithoutsomePowermovingthroughthemediumofsomesubordinateagency,everactingonthesun,tosendsuchfloodsoflightandheattoourotherwisecoldanddarkterrestrialball;butitistheoverwhelmingmagnitudeofsuchpowerthatweareincapableofcomprehending。Theagencynecessarytothrowoutthefloodsofflameseenduringthefewmomentsofatotaleclipseofthesun,andthepowerrequisitetoburstopenacavityinitssurface,suchascouldentirelyengulphourearth,willeversetallthethinkingcapacityofmanatnought。“
TheObservatory,Nos。34,42,45,49,and58。
WeregrettosaythatSheriffBarclaydiedafewmonthsago,greatlyrespectedbyallwhoknewhim。
SirE。DenisonBeckett,inhisRudimentaryTreatiseonclocksandWatchesandBells,hasgivenaninstanceorthetelescope-drivingclock,inventedbyMr。Cookep。213。
J。NormanLockyer,F。R。S——Stargazing,PastandPresent,p。
302。
Thisexcellentinstrumentisnowinthepossessionofmyson-in-law,Dr。Hartree,ofLeigh,nearTunbridge。
AninterestingaccountofMr。AlvanClarkisgiveninProfessorNewcomb’s’PopularAstronomy,’p。137。
AphotographicrepresentationofthisremarkabletelescopeisgivenasthefrontispiecetoMr。Lockyer’sStargazing,PastandPresent;andafulldescriptionoftheinstrumentisgiveninthetextofthesamework。Thisrefractingtelescopedidnotlongremainthelargest。Mr。AlvanClarkwascommissionedtoerectalargerequatorialforWashingtonObservatory;theobject-glasstheroughdisksofwhichwerealsofurnishedbyMessrs。ChanceofBirminghamexceedinginaperturethatofMr。
Cooke’sbyonlyoneinch。ThiswasfinishedandmountedinNovember,1873。AnotherinstrumentofsimilarsizeandpowerwasmanufacturedbyMr。ClarkfortheUniversityofVirginia。Buttheseinstrumentsdidnotlongmaintaintheirsupremacy。In1881,Mr。HowardGrubb,ofDublin,manufacturedastilllargerinstrumentfortheAustrianGovernment——theobject-glassbeingoftwenty-seveninchesaperture。ButMr。AlvanClarkwasnottobebeaten。In1882,hesuppliedtheRussianGovernmentwiththelargestrefractingtelescopeinexistencetheobject-glassbeingofthirtyinchesdiameter。Eventhis,however,istobesurpassedbythelenswhichMr。ClarkhasinhandfortheLickObservatoryCalifornia,whichistohaveaclearapertureofthreefeetindiameter。
[11]Sincetheabovepassagewaswrittenandintype,IhaveseeninSeptember1884thereflectingtelescopereferredtoatpp。
357-8。Itwasmountedonitscast-ironequatorialstand,andatworkinthefieldadjoiningthevillagegreenatBainbridge,Yorkshire。Themirrorofthetelescopeis8inchesindiameter;
itsfocallength,5feet;andthetubeinwhichitismounted,about6feetlong。Theinstrumentseemedtometohaveanexcellentdefiningpower。
ButMr。Lancaster,likeeveryeagerastronomer,isanxiousforfurtherimprovements。Heconsiderstheachromatictelescopethekingofinstruments,andisnowengagedintestingconvexopticalsurfaces,withaviewtoachievingatelescopeofthatdescription。Thechiefdifficultyistheheavychargeforthecircularblocksofflintglassrequisitefortheworkwhichhemeditates。“That,“hesays,“isthegreatdifficultywithamateursofmyclass。“Hehas,however,alreadycontrivedandconstructedamachineforgrindingandpolishingthelensesinanaccurateconvexform,anditworksquitesatisfactorily。Mr。
Lancastermakeshisowntools。Fromtherawmaterial,whetherofglassorsteel,heproducestheworkrequired。Astotools,allthatherequiresisabarofsteelandfire;hisfertilebrainandbusyhandsdotherest。Ilookedintothelittleworkshopbehindhissitting-room,andfounditfullofingeniousadaptations。Theturninglatheoccupiesaconsiderablepartofit;butwhenherequiresmorespace,thevillagesmithwithhisstithy,andthemillerwithhiswater-power,arealwaysreadytohelphim。Histools,thoughnotshowy,areeffective。Hisbestlensesaremadebyhimself:thosewhichhebuysarenottobedependedupon。ThebestflintglassisobtainedfromParisinblocks,whichhedivides,grinds,andpolishestoperfectform。
Iwasattractedbyanewlymademachine,placedonatableinthesitting-room;andoninquiryfoundthatitsobjectwastogrindandpolishlenses。Mr。Lancasterexplainedthatthedifficultytobeovercomeinagoodmachine,istomaketheemerycutthesurfaceequallyfromcentretoedgeofthelens,sothatthelenswillneitherlengthennorshortenthecurveduringitsproduction。Toquotehiswords:“Thisreallyinvolvestheproblemofthe’threebodies,’ordisturbingforcessocelebratedindynamicalmathematics,anditisfurthercomplicatedbyanotherquantity,the’coefficientofattrition,’orworkdonebythegrindingmaterial,aswellasthemischiefdonebycapillaryattractionandnodalpointsofsuperimposedcurvesinthepathofthetool。Thesecomplicationstendtocauseringsorwavesofunequalwearinthesurfaceoftheglass,andruinthedefiningpowerofthelens,whichdependsupontheuniformityofitscurve。Astheoutcomeofmuchpracticalexperiment,combinedwithmathematicalresearch,Isettledupontheratioofspeedbetweenthesheaveofthelens-toolguideandtheturn-table;
betweenwhoselimitsthepracticalequalizationofwearorcutoftheemerymightwiththegreaterfacilitybeadjusted,bymeansofvaryingthestrokeandeccentricityofthetool。Astheresultoftheseconsiderationsintheconstructionofthemachine,thesurfaceoftheglass’comesup’regularlyalloverthelens;andthepolishingonlytakesafewminutes’work——thuskeepingthetruthofsurfacegainedbyusingarigidtool。“
Themachineinquestionconsistsofarevolvingsheaveorring,withaslidingstripacrossitsdiameter;thesaidstriphavingaslotandclampingscrewatoneend,andaholetowardstheother,throughwhichpassestheaxisofthetoolusedinformingthelens,——theslotinthestripallowingthetooltogiveanystrokefrom0to1。25inch。Thelensiscarriedonarevolvingturn-table,withanarrangementtoallowtheaxisofthelenstocoincidewiththeaxisofthetable。Theratioofspeedbetweenthesheaveandturn-tableisarrangedbybeltandproperlysizedpulleys,andthewholecanbedriveneitherbyhandorbypower。
Thesheavemerelyservesasaguidetothetoolinitspath,andthelensmayeitherbeworkedontheturn-tableoruponachuckattachedtothetoolrod。Theworkuponthelensisthustoagreatextentindependentoftheerrorofthemachinethroughshaking,orbadfitting,orwear;andtheonlypartofthemachinewhichrequiresreallyfirst-classworkistheaxisoftheturn-table,whichinthismachineisaconicalbearingattop,withsteelcentrebelow,——thebearingturned,hardened,andthengrounduptrue,andruninanti-frictionmetal。Otherdetailsmightbegiven,buttheseareprobablyenoughforpresentpurposes。Wehope,atsomefuturetime,foraspecialdetailofMr。Lancaster’sinterestinginvestigations,fromhisownmindandpen。
[12]ThetranslationsaremadebyW。CadwalladrDavies,Esq。
[13]ThisevidencewasgivenbyMr。W。CadwalladrDaviesonthe28thOctober,1880。
End