On Magnetic Rotatory Power, Especially of Aromatic Compounds (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from On Magnetic Rotatory Power, Especially of Aromatic Compounds

The circle is 405 cm. (16 in.) in diameter, and is provided with an edge made of white metal (platinite) on which the divisions are marked. The divisions are the of a degree this scale gives, with avemier of a comb shape, which is placed in the eye-piece of the highly magnifying telescope I, Fig. 2, the l/l20th of a degree, or 30 seconds of arc. The scale is reflected into the telescope by means of a right angled prism, and illuminated by means of a small gas jet in a brass lantern. As all the determinations I have hitherto made have been relative to the rotations of water, and only a small part of the circle has, therefore, been used, a double vemier has not been required. It has also been found experimentally that the relative rotations measured with'the polarising prism and circle at the two positions 180° apart give practically the same results. J is a clamp to fix the circle when roughly adjusted by hand, and K is a double threaded screw for the fine adjustment. At first, a single threaded screw was employed, but it was found to give too slow a motion for the eye to readily discern the changes in the shadow.

The position of the analysing prism is adjusted by the tangent screw M, Fig. 2.

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