Author: Howard TownsendPublisher: Forgotten Books
ISBN: 9781390990096
Category : Science
Languages : en
Pages : 20
Book Description
Excerpt from The Sunbeam and the Spectrascope: Read Before the Albany Institute, Feb. 17th, 1863 If a sunbeam be allowed to enter a darkened room, it falls on the floor and forms a disc of bright light. This is radi ated to the eye which conveys the impression to the brain, and the phenomenon of vision is established. Should the hand he placed in the track of the sunbeam, the sensation of warmth is communicated, and we feel there is heat in the ray. If a piece of paper covered over with chloride of silver, which is purely white, be placed so that the sunbeam falls upon it, a darkened track will be immediately produced over the space the sun's ray has passed, it has liberated the chlorine, leaving the metallic silver. Such remarkable phenomena teach us that we have to deal with agencies in the solar rays, which are in their visi ble effects very dissimilar. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
