Excerpt from A Course of Lectures on Natural Philosophy and the Mechanical Arts, Vol. 2 of 2 The fir'st part of thisvolume, consisting Of the mathematical elements of natural philosophy, is in part reprinted from the syllabus of the lectures, but considerable additions have been made to it, both of elementary matter and of original investigations. These elements are pterfectly in dependent of every other work introductory to any branch of the ma thematics, and they comprehend all the propositions which are required for forming a' complete series of demonstrations, leading to every case of' importance that occurs-in naturalphilosophy, with the exception of some of the more intricate calculations of astronomy. It was therefore absolutely necessary that they should be expressed in the most concise manner that was possible; yet except a few propositions which have been cursoril y introduced in some of the scholia, no essential step of a demon stration has ever been omitted. The best use, that a Student'could make of these elements, would be to read over each theorem or problem superficially, then to endeavour to form for himself a more particular demonstration, and to compare this again with that which is here given for the exertion of a certain degree of invention is by far the Surest mode of fixing any principle Of science in the mind. 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.

In The Enlightened Joseph Priestley Robert Schofield completes his two-volume biography of one of the great figures of the English Enlightenment. The first volume, published in 1997, covered the first forty years of Joseph Priestley’s life in England. In this second volume, Schofield surveys the mature years of Priestley, including the achievements that were to make him famous—the discovery of oxygen, the defenses of Unitarianism, and the political liberalism that characterized his later life. He also recounts Priestley’s flight to Pennsylvania in 1794 and the final years of his life spent along the Susquehanna in Northumberland. Together, the two volumes will stand as the standard biography of Priestley for years to come. Joseph Priestley (1733–1804), a contemporary and friend of Benjamin Franklin and Thomas Jefferson, exceeded even these polymaths in the breadth of his curiosity and learning. Yet Priestley is often portrayed in negative terms, as a restless intellect, incapable of confining himself to any single task, without force or originality, and marked by hasty and superficial thought. In The Enlightened Joseph Priestley, he emerges as a man who was more than a lucky empiricist in science, more than a naive political liberal, more than an exhaustive compiler of superficial evidence in militant support of Unitarianism. In fact, he was learned in an extraordinary variety of subjects, from grammar, education, aesthetics, metaphysics, politics, and theology to natural philosophy. Priestley was, in fact, a man of the Enlightenment.

Joseph Priestley (1733&–1804) is one of the major figures of the English Enlightenment. A contemporary and friend of Benjamin Franklin and Thomas Jefferson, he exceeded even these polymaths in the breadth of his curiosity and learning. Yet no one has attempted an all-inclusive biography of Priestley, probably because he was simply too many persons for anyone easily to comprehend in a single study. Robert Schofield has devoted a lifetime of scholarship to this task. The result is a magisterial book, covering the life and works of Priestley during the critical first forty years of his life. Although Priestley is best known as a chemist, this book is considerably more than a study in the history of science. As any good biographer must, Schofield has thoroughly studied the many activities in which Priestley was engaged. Among them are theology, electricity, chemistry, politics, English grammar, rhetoric, and educational philosophy. Schofield situates Priestley, the provincial dissenter, within the social, political, and intellectual contexts of his day and examines all the works Priestley wrote and published during this period. Schofield singles out the first forty years of Priestley's life because these were the years of preparation and trial during which Priestley qualified for the achievements that were to make him famous. The discovery of oxygen, the defenses of Unitarianism, and the political liberalism that characterize the mature Priestley&—all are foreshadowed in the young Priestley. A brief epilogue looks ahead to the next thirty years when Priestley was forced out of England and settled in Pennsylvania, the subject of Schofield's next book. But this volume stands alone as the definitive study of the making of Joseph Priestley.

Energy is at the heart of physics and of huge importance to society and yet no book exists specifically to explain it, and in simple terms. In tracking the history of energy, this book is filled with the thrill of the chase, the mystery of smoke and mirrors, and presents a fascinating human-interest story. Moreover, following the history provides a crucial aid to understanding: this book explains the intellectual revolutions required to comprehend energy, revolutions as profound as those stemming from Relativity and Quantum Theory. Texts by Descartes, Leibniz, Bernoulli, d'Alembert, Lagrange, Hamilton, Boltzmann, Clausius, Carnot and others are made accessible, and the engines of Watt and Joule are explained. Many fascinating questions are covered, including: - Why just kinetic and potential energies - is one more fundamental than the other? - What are heat, temperature and action? - What is the Hamiltonian? - What have engines to do with physics? - Why did the steam-engine evolve only in England? - Why S=klogW works and why temperature is IT. Using only a minimum of mathematics, this book explains the emergence of the modern concept of energy, in all its forms: Hamilton's mechanics and how it shaped twentieth-century physics, and the meaning of kinetic energy, potential energy, temperature, action, and entropy. It is as much an explanation of fundamental physics as a history of the fascinating discoveries that lie behind our knowledge today.