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

CHAPTER II.

Chapter 883 wordsPublic domain

OF THE CAMERA OBSCURA.

Appearance of objects in a camera obscura--The dark chamber--This instrument serves to explain the nature of a refracting telescope--Particulars to be attended to, in exhibiting objects with the Camera--It illustrates the nature of vision--Revolving camera obscura--_Portable_ camera

_page_ 184-196.

THE DAGUERREOTYPE.

An important discovery for fixing the images produced by the camera--Description of the Daguerreotype process--Preparation of the plate, fixing the impression, &c.--Preparation of photogenic paper--Beneficial effects which this art may produce--Representations of objects in the heavens, &c.

_page_ 196-205.