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Corrections des réfractions, relatives à la température.

Les réfractions de la TABLE V, répondent à + 14° du thermomètre centigrade Le froid augmente la réfraction.

Ajoutez les nombres ci-dessous aux réfractions de la TABLE V;

Retranchez-les des nombres de la TABLE VIII, ou de la parallaxe de la C moin la réfraction.

Thermomètre centigrade.

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+28°.+30°.

TABLE VI.

Corrections des réfractions, relatives à la température.

Les réfractions de la TABLE V, répondent à + 14° du thermomètre centigrade. La chaleur diminue la réfraction.

Retranchez les nombres ci-dessous des réfractions de la TABLE V;

Ajoutez-les aux nombres de la TABLE VIII, ou à la parallaxe de la moins. la réfraction.

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17

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Hauteur apparente.

+14°.+ 16o. +180.

+ 20°. + 22°.

+24°.+26°.

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110,2+120,8 +14°,4 + 16° +170,6 +190,2 +20°,8 +220,4 | + 24°

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Thermomètre de Réaumur.

TABLE VII.

Corrections des réfractions, relatives au poids de l'atmosphère.

Les réfractions de la TABLE V ont lieu, lorsque l'atmosphère soutient une colonne de mercure de o",760.

Les réfractions augmentent en même tems que le poids de l'atmosphère. Ajoutez les nombres ci-dessous aux réfractions de la TABLE V; Retranchez-les des nombres de la TABLE VIII, ou de la parallaxe de la C moins la réfraction.

Hauteur du baromètre, en mètres.

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0,785 0,780 om,775 om,770 om,765 om,760

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Hauteur apparente.

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60

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Hauteur du baromètre, en pouces.

TABLE VII.

Corrections des réfractions, relatives au poids de l'atmosphère.

Les réfractions de la TABLE V ont lieu, lorsque l'atmosphère soutient une colonne de mercure de om,760.

Les réfractions diminuent en même tems que le poids de l'atmosphère. Retranchez les nombres ci-dessous des réfractions de la TABLE V; Ajoutez-les aux nombres de la TABLE VIII, ou à la parallaxe de la C moins la réfraction.

Hauteur du baromètre, en mètres.

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om,760 om,755 om,750 om,745 om,740 om,735 om,730 om,725

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Haute r apparente.

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28P.0',9 27P.10,8 27P.81,5 27P.61,3 27P.4, 127P. 11,8 26P. 11',6 26P.9',4

Hauteur du baromètre, en pouees.

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