awardedhim，uponafulldiscoveryoftheprinciplesofhistime-keeper，thepaymentofsuchasum，aswiththe2500L。hehadalreadyreceived，wouldmakeonehalfofthereward；andtheremaininghalfwastobepaidwhenotherchronometershadbeenmadeafterhisdesign，andtheircapabilitiesfullyproved。Hewasalsorequiredtoassignhisfourchronometers——oneofwhichwasstyledawatch——totheuseofthepublic。
HarrisonatonceproceededtogivefullexplanationsoftheprinciplesofhischronometertoDr。Maskelyne，andsixothergentlemen，whohadbeenappointedtoreceivethem。Hetookhistimekeepertopiecesintheirpresence，anddepositedintheirhandscorrectdrawingsofthesame，withtheparts，sothatotherskilfulmakersmightconstructsimilarchronometersonthesameprinciples。Indeed，therewasnodifficultyinmakingthem；
afterhisexplanationsanddrawingshadbeenpublished。AnexactcopyofhislastwatchwasmadebytheingeniousMr。Kendal；andwasusedbyCaptainCookinhisthreeyears’circumnavigationoftheworld，tohisperfectsatisfaction。
Englandhadalreadyinauguratedthatseriesofscientificexpeditionswhichweretoprovesofruitfulofresults，andtoraisehernavalreputationtosogreataheight。Intheseexpeditions，theofficers，thesailors，andthescientificmen，wereconstantlybroughtfacetofacewithunforeseendifficultiesanddangers，whichbroughtforththeirhighestqualitiesasmen。
Therewas，however，someintermixtureofnarrownessinthemindsofthosewhosentthemforth。Forinstance，whileDr。PriestleywasatLeeds，hewasaskedbySirJosephBankstojoinCaptainCook’ssecondexpeditiontotheSouthernSeas，asanastronomer。