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Titre : Oeuvres complètes de Christiaan Huygens. Correspondance [de Christiaan Huygens], 1666-1669 / publ. par la Société hollandaise des sciences
Auteur : Huygens, Christiaan (1629-1695). Auteur du texte
Éditeur : M. Nijhoff (La Haye)
Date d'édition : 1888-1950
Contributeur : Koninklijke Hollandsche maatschappij der wetenschappen. Éditeur scientifique
Sujet : Huygens, Christiaan (1629-1695) -- Contribution aux mathématiques
Sujet : Huygens, Christiaan (1629-1695)
Notice d'ensemble : http://catalogue.bnf.fr/ark:/12148/cb38949978f
Type : monographie imprimée
Langue : latin
Langue : français
Langue : néerlandais
Format : 23 vol. : ill. ; 29 cm
Description : Correspondance
Description : Autobiographie
Droits : Consultable en ligne
Droits : Public domain
Identifiant : ark:/12148/bpt6k778547
Source : Bibliothèque nationale de France, département Philosophie, histoire, sciences de l'homme, 4-R-788 (6)
Conservation numérique : Bibliothèque nationale de France
Date de mise en ligne : 15/10/2007
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And thefe ï min. fec. that is, !o~. fec. being divided by8,there cornes tg~ iec. for the différence of every 24. hours; which différence being khown, if you want time, or have no mind to take thé pains to adjuit the Watch to its right meafure (this being not neceffary, fince you may bring it thus on fhip-board) note onetv the daity différence, and regulate your felf accordingty, as hath been mention'd. But if you will adjuft it better, you rnuH remove the lefs weight ofthe Pendutum.a little downwards, which will make it goe uower; and then you muft begin to obferve anew, by the Sun, as before. If it had gone too How, you mutt have remov'd the mention'd weight fomewhat upwards. And this is of that importance in thé finding out of Longitudes 3), that, if it be not obt'erv'd, you may tbmetimes in thé fpace of 3 months mifreckon degrees and more (yet without any fault in the Watches;) which under the Tropicks will amount to above 400 Englifh miles.
Having fhew'd, How the Watches may be adjuited ai Land, or how their daily difference may be known; next fhall follow, How the fame may be done, when a Veffel rides at anchor, it being hardly fefible when fhe is under faile.
In the morning then, when the Sun is jutt hatf above the Horizon, note, what hour, min. and fec. the Watch points at, if it be going; if not, fet.it a going, and put the Indexes, at what hour, min. and iec. you p!ea<e. Let them goe till Sun-fet, and when the Body of the Sun is juft half under the Horizon, fée, what hour, min. and fec. the Indexes of the Watch point at, and note them too; and reckon, how many heures ë~f. are PaiT'd by the Watch between the one and the other which is done by adding to the Evening-Obfervation the hours, @'c. that the morning-Obfervation wanted of ta. or 2~. in café the Hour-hand hath in the meantimepafTdthat hour once or twice; otherwife the difference only gives the time. Then take the half of that number, and add it to the hours, @'< of the morning-Obfervation, and you fhall have the hours, @'c., which the Watch did fhow, when the Sun was in the South; whereunto add the Aequation in the Table belonging to that day, and note the fumme. Then fome days being pasfd (thé more the better) your are to doe luit the famé And if the hour of this taH day be the famé, that was noted before, your Watch is well adjufted; but if it be more or lefs, the différence divided by the number, elapfed between the two Obfervations, will give the daily difference. And if you will, you may let it reil there, or otherwife, removing the leffer weight of the Pendulum you may adjuft it better.
3) Consuttex, sur cette phrase, la Lettre ?. 1754.