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9. Commission des Instruments Astronomiques

Extract

La Commission n’a pas été informée de travaux particuliers importants concernant les matières d’optique. Il convient toutefois de mentionner dans cet ordre d’idées les résultats intéressants obtenus par application d’une pellicule d’aluminium comme surface réfléchissante, pour les miroirs astronomiques.

Le dépôt est fait par évaporation dans le vide et s’applique immédiatement aux miroirs en verre de petites dimensions. Pour les grandes surfaces, l’installation capable de résister à la pression atmosphérique peut présenter de grandes difficultés. Cependant, il a été possible de traiter ainsi, par exemple, le miroir de 90 cm. de diamètre de l’Observatoire de Lick. Plusieurs observatoires américains ont mis en service des miroirs aluminisés.

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