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 telescopes, and other topics connected with astronomy

PART I.

Chapter 129 wordsPublic domain

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

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