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VALEURS NUMÉRIQUES DES CONSTANTS

employés au calcul des Longueurs d'onde des raies de Fraunhofer.

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XII

A. J. ANGSTRÖM,

SPECTRE NORMAL DU SOLEIL.

Valeurs de Q. et de logr pour calculer les angles de déviation Q.

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PROCÈS-VERBAL

de vérification d'un mètre à traits de l'université d'Upsal.

Monsieur ÅNGSTRÖM, professeur à l'université d'Upsal, a fait construire par M. BRUNNER un mètre en laiton, dont il a desiré que la comparaison soit faite, à la température de la glace fondante, avec l'étalon prototype en platine du Conservatoire Impérial des arts et métiers.

vantes:

Ce mètre est formé d'une règle massive en laiton dont les dimensions sont les sui

longueur 1",10; largeur 0,0285; épaisseur 0,0179.

Sur la face supérieure de cette règle, on a encastré 11 mouches en argent, d'un diamètre de 6 millimètres, destinées à recevoir les traits de division, de décimètre en décimètre.

Pour comparer les distances comprises entre les deux traits extrêmes et la longueur du mètre prototype, à bout, on s'est servi du comparateur de Gambey, au moyen duquel on a visé les traits du mètre en vérification, d'une part, et d'autre part les traits de deux talons en bronze proposés par M. TRESCA et qui viennent palper exactement les extrémités de la ligne moyenne du mètre prototype, ligne dont la longueur a été exactement comparée avec la ligne correspondante du mètre prototype des archives suivant procès-verbal en date du 5 Mars 1864 et dont un exemplaire est joint à la présente description.

Afin d'opérer à la glace fondante, la table du comparateur a été remplacée par une auge dans laquelle un fort plateau en fonte, immergé dans de l'eau contenant toujours un grand nombre de fragments de glace, recevait successivement les deux mesures à comparer. La comparaison a été faite le vendredi 12 Octobre par M. M. ÅNGSTRÖM et TRESCA. Les indications données par les micromètres peuvent être résumées de la manière suivante:

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