Y Year, its length, how measured, i. 190. Gregorian, 193. Z Zenith, that point of the heavens over one's head. Zodiac, a belt in the heavens, sixteen degrees broad, CONTENTS OF VOL. III. Conversation OPTICS. I. Light: the Smallness and Velocity of its II. Rays of Light :-Reflection and Refraction IV. Refraction and Reflection of Light VI. Parallel, diverging, and converging Rays IX. Colours X. Reflected Light and Plain Mirrors XI. XII. Concave Mirrors-Experiments XIV. Optical Deceptions, Anamorphoses, &c. XV. Different parts of the Eye XVII. Spectacles, and their Uses XIX. Refracting Telescopes XXI. Microscope MAGNETISM. GALVANISM, OR VOLTAISM. XXXV. Experiments with the Battery XXXVI. Miscellaneous Experiments XXXVII. Electrophorus, Thunder-House, &c. XXXVIII. Atmospherical Electricity XLIII. The Origin of Galvanism, XLIV. Galvanic Light and Shocks XLV. Voltaic Conductors, Circles, Tables, &c. |
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