ship nautical equipment ship carried voyage world held subject episode bbc series history world objects meticulous naval hms carried total recorded main survey second voyage darwin board dedicated cabin navy property loan manufacturers second voyage owned captain known survivors second voyage owned second loan canberra background nautical great importance 18th 19th centuries aids navigation accurate measurement time needed determination started essential equipment ship sea time set sail reported price dropping rapidly quality maintained novel mechanism spring strip temperature compensation continue maintain accuracy climates world sent survey mission involved globe journey described naturalist board ship book voyage lasted journey darwin began form ideas published later carried unusually large number necessary ensure accuracy survey commonplace ships time minimum number required easily identify gone faulty admiralty started general issue availability demand admiralty issued ship captain personally owned cases admiralty issue second machine total reasoning ship better event possible identify faulty instrument gone years required ashore boat expeditions rivers determine coordinates specific reference points instructed admiralty guaranteed continue function accurately survive journey mounted level sea conditions assembly fixed inside wooden box protection additional protection stored special cabin captain quarters crew needed measurements maintained allowed access measures indicate importance attached instruments voyage succeeded time establishing linked chain reference points globe known subsequent maintenance accuracy maintained instrument maker salary paid personally captain vessel considered post essential mission admiralty refused pay bore cost ship equipment admiralty fed ship rations concession extended darwin paid able measure overall accuracy entire journey measure time local noon returned home port sailed west local noon occurred progressively later finally globe shift local noon time measured exactly hours fact measurements exceeded seconds equivalent nautical miles impressive journey tens thousands miles years considered error large history manufactured served number royal_navy ships exploring july attempt find mentions determine spot measurement ship board early time royal_navy purchased issued checked rates sent cleaning initially issued directly ships later common sent royal_navy ports issue locally recorded issue july captain command took anglo war lasted returned february sent makers come nearly years march issued captain command time famous ship command second expedition find members public visited ship waited set expedition attempt abandoned leading ship abandoned ice damage attempt reach gave admiralty sent survey west african coast command july returned went cleaning london returned november immediately issued ship portsmouth devonport march delivered devonport rate checked recorded december issued captain command hms sailed captain command famous second voyage returned november period arnold cleaning transported portsmouth issue ships returned november service arnold issued january stayed formidable november returned serviced sent issue ships portsmouth transported periodically royal_navy ships service hms march hms december finally returned portsmouth final ship issued received april returned february use shore serving stayed months issued november observations observatory returned november sent november returned december declaring economic repair given july exchange later acquired private collector death collection auction auction cancelled collection purchased following private donation funds object series history world objects broadcast october series collaboration presented director specialist contributors episode vice chancellor television presenter programme discussed search role played contributions design voyage importance carried
Ship's chronometer from HMS Beagle