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84

Annal. Gliim. Phys. (7), 23, page 564, (1901).

„ “ (7), 24, page 119 (1901).

(7), 25, page 98 (1902).

Comptes Rendas, 138, page 676 (1904).

Annal. Chim. Phys. (8), 1, page 5 (1904).

Comptes Rendus, 138, page 854 (1904).

Journal de Physique, 3, page 842 (1904).

„ 4, page 245 (1905).

Comptes Rendus, 140, pages 848, 1136 (1905).

144, page 1082 (1907).

Journal de Physique, March (1908).

,, June (1908).

Astrophys. Jour., 31, 97, March (1910).

This apparatus is shown in Fig. 1. Screw, 1 mm. pitch, the thread being 120 mm. long. Motion of the carriage, 75 mm.

The divided head attached to the screw has 100 divisions, and one turn of the slow motion screw (whose head also is divided into a hundred parts) corresponds with one division on the main drumhead. Thus, one division on the drumhead of the slow-motion screw corresponds with ^o mm. (one ten thousandth of a millimetre).

The slides are very massive, and are worked optically flat; and this, combined with great care in mounting, produces the desired accuracy in maintaining the parallelism of the mirror when moved from one position to another.

The plates are silvered by cathodic deposition from freshly electrolytically deposited silver. With silver films deposited in this manner, the loss of light is less than with any other kind of reflecting film, and the necessary condition for sharply defined and bright intensity maxima is thus fulfilled. The plates are made slightly wedge-shaped in the usual manner, to avoid the secondary interference systems caused by reflections at the unsilvered outer surfaces.

The final adjustment of parallelism of the mirrors is obtained by the screws A and B, which cause alterations in the tensions of springs which are attached to one of the mirror mounts, this mirror mount being thus rotated through a very small angle about a vertical or horizontal axis as the case may be.

Le texte affiché peut comporter un certain nombre d'erreurs. En effet, le mode texte de ce document a été généré de façon automatique par un programme de reconnaissance optique de caractères (OCR). Le taux de reconnaissance estimé pour cette page est de 99,47 %.

La langue de reconnaissance de l'OCR est l'Anglais.