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: The Practical Astronomer Comprising illustrations of light and colours practical descriptions of all kinds of telescopes the use of the equatorial-transit circular and other astronomical instruments a particular account of the Earl of Rosse's large tel by

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ON LIGHT.

INTRODUCTION.

Necessity of light to the knowledge and happiness of all sentient beings--Its beautiful and enlivening effects--An emblem of the Deity--Provision made for its universal diffusion

GENERAL PROPERTIES OF LIGHT.

Reflections on the nature of light, and the multifarious effects it produces throughout the universe--A representation of the Divinity--Wisdom and Goodness of God displayed in its formation

ON THE REFRACTION OF LIGHT.

Nature of refraction--Illustrated by experiments--Angle of refraction--Familiar experiments illustrative of refraction--Refraction explains the causes of many curious and interesting phenomena--Its effect on the heavenly bodies--On the twilight--Illustrated by figures

EXTRAORDINARY CASES OF REFRACTION IN RELATION TO TERRESTRIAL OBJECTS.

Extraordinary appearance of the coast of France from Hastings--Appearance of a ship seen by Captain Colby, beyond the coast of Caithness--Scoresby's view of his father's ship when beyond the horizon--Phenomenon near the Himalaya mountains--Bell Rock light-house--Summary statement of the diversified effects of refraction--Reflections on the beneficent and diversified effects produced by the law of refraction--It increases the length of the day, particularly in the polar regions--Is the cause of that splendour which appears in the objects around us--Quantity of refraction in respect to terrestrial objects, and its utility--Its effects may be more diversified in other worlds

ON THE REFRACTION OF LIGHT THROUGH SPHERICAL TRANSPARENT SUBSTANCES, OR LENSES.

REFLECTIONS DEDUCED FROM THE PRECEDING SUBJECT.

ON THE REFLECTION OF LIGHT.

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