Excerpt from The Sling: Letters to the Royal Institution, the Institution of Civil Engineers and the Admiralty, May 1905 to May 1912 The reason why the Professor was not able to Show a clear logical connection between the facts be dealt with and Radiation Pressure is because no such radiation of heat through space of the character imagined does in fact exist. Interplanetary Space is colder than ice. And it is only where the transverse action of the sun's gravitation acts on other bodies in space that heat is created by the clashing of their forces of gravitation. The sun's trans verse action which creates the heat is itself the force which the lecturer treated as Pressure due to Radiation of heat. The heat is a consequence of the action of the forces by which the effects are caused, and not the cause of those effects. The idea of the sun parting with heat radiated across Space to warm the earth is an exploded fancy. The sun, in fact, gets from the action of the earth's gravitation on it as much heat as the earth gets from the sun's action. Action and reaction are equal as regards that creation of heat in the two bodies. 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.