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Notice complète
Titre : Oeuvres complètes de Christiaan Huygens. Correspondance [de Christiaan Huygens], 1666-1669 / publ. par la Société hollandaise des sciences
Auteur : Huygens, Christiaan (1629-1695)
Éditeur : M. Nijhoff (La Haye)
Date d'édition : 1888-1950
Contributeur : Koninklijke Hollandsche maatschappij der wetenschappen. Éditeur scientifique
Sujet : Huygens, Christiaan (1629-1695) -- Correspondance
Sujet : Huygens, Christiaan (1629-1695) -- Contribution aux mathématiques
Sujet : Huygens, Christiaan (1629-1695) -- Biographies
Type : monographie imprimée
Langue : Latin
Format : 23 vol. : ill. ; 29 cm
Format : application/pdf
Droits : domaine public
Identifiant : ark:/12148/bpt6k778547
Source : Bibliothèque nationale de France, département Philosophie, histoire, sciences de l'homme, 4-R-788 (6)
Relation : Notice d'ensemble : http://catalogue.bnf.fr/ark:/12148/cb38949978f
Relation : http://catalogue.bnf.fr/ark:/12148/cb38949978f
Provenance : bnf.fr
(Vue 467 / 679)
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CORRESPONDANCE. ï66o.
45'
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 ob-
ferve 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
them goe till Sun-fet, and when the Body of the Sun is juft half under the Ho-
rizon, 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-Obfer-
vation 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 Pendu-
lum you may adjuft it better.
3) Consuttex, sur cette phrase, la Lettre ?. 1754.
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