Fifty Major Political Thinkers introduces the lives and ideas of some of the most influential figures in Western political thought, from ancient Greece to the present day. The entries provide a fascinating introduction to the major figures and schools of thought that have shaped contemporary politics, including:

• Aristotle
• Simone de Beauvoir
• Michel Foucault
• Mohandas Gandhi
• Jurgen Habermas
• Machiavelli
• Karl Marx
• Thomas Paine
• Jean-Jacques Rousseau
• Mary Wollstonecraft.

Fully cross-referenced and including a glossary of theoretical terms, this wide-ranging and accessible book is essential reading for anyone with an interest in the evolution and history of contemporary political thought.

Fifty Major Political Thinkers introduces the lives and ideas of some of the most influential figures in Western political thought, from ancient Greece to the present day. The entries provide a fascinating introduction to the major figures and schools of thought that have shaped contemporary politics, including:

• Aristotle
• Simone de Beauvoir
• Michel Foucault
• Mohandas Gandhi
• Jurgen Habermas
• Machiavelli
• Karl Marx
• Thomas Paine
• Jean-Jacques Rousseau
• Mary Wollstonecraft.

Fully cross-referenced and including a glossary of theoretical terms, this wide-ranging and accessible book is essential reading for anyone with an interest in the evolution and history of contemporary political thought.

Injection moulding is one of the most important methods of manufacturing plastics products. Through the development of sophisticated micro processor control systems, the modern injection moulding machine is capable of producing precision mouldings with close tolerances in large numbers and with excellent reproducibility. This capability, however, is often limited by the lack of a proper appreciation of mould design. The mould, or tool as it is often called, is at the heart of the injection moulding process. Its basic function is to accept the plastic melt from the injection unit and cool it to the desired shape prior to ejection. It is not, however, simply a matter of the mould having an impression of the shape to be moulded. Many other factors have to be taken into account - for example, the ability to fill the mould impression properly and efficiently without inducing weaknesses in the moulding and the efficient cooling of the moulding in order to maximise production rates without diminishing the quality of the moulding. In addition, the type of mould, gate and runner system, and ejection system which will best meet the needs of a particular job specification have to be determined. In our experience lack of attention to such factors leads to the mould limiting the ability of the injection moulding machine and preventing the process as a whole from achieving its true potential.

R. W. DYSON There will be few readers of this book who are not aware of the contribution that polymers make to modern life. They are to be seen around the home, at work, in transport and in leisure pursuits. They take many forms which include plastic mouldings and extrusions, plastic film and sheet, plastic laminates (fibreglass and formica), rubber gloves, hoses, tyres and sealing rings, fibres for textiles and carpets and so on, cellular products for cushioning and thermal insulation, adhesives and coating materials such as paints and varnishes. The majority of these polymers are synthetic and are derived from oil products. The most important of these in terms of tonnage used are polymers based upon styrene, vinyl chloride, ethylene, propylene and butadiene among plastics and rubber materials, and nylons, polyethyleneterephthalate and poly acrylonitrile among fibres. The total amount of these polymers used each year runs into millions of tonnes. These polymers are sometimes known as commodity polymers because they are used for everyday artefacts. They are available in many grades and formats to meet a variety of applications and processing techniques. The properties can be adjusted by using additives such as heat and light stabilizers, plasticizers, and reinforcing materials. Often, grades are specially designed and formulated to meet particular requirements and, in a sense, these might be regarded as specialities. Much has been written about these materials elsewhere and they are not the concern of this book.

R. W. DYSON There will be few readers of this book who are not aware of the contribution that polymers make to modern life. They are to be seen around the home, at work, in transport and in leisure pursuits. They take many forms which include plastic mouldings and extrusions, plastic film and sheet, plastic laminates (fibreglass and formica), rubber gloves, hoses, tyres and sealing rings, fibres for textiles and carpets and so on, cellular products for cushioning and thermal insulation, adhesives and coating materials such as paints and varnishes. The majority of these polymers are synthetic and are derived from oil products. The most important of these in terms of tonnage used are polymers based upon styrene, vinyl chloride, ethylene, propylene and butadiene among plastics and rubber materials, and nylons, polyethyleneterephthalate and poly acrylonitrile among fibres. The total amount of these polymers used each year runs into millions of tonnes. These polymers are sometimes known as commodity polymers because they are used for everyday artefacts. They are available in many grades and formats to meet a variety of applications and processing techniques. The properties can be adjusted by using additives such as heat and light stabilizers, plasticizers, and reinforcing materials. Often, grades are specially designed and formulated to meet particular requirements and, in a sense, these might be regarded as specialities. Much has been written about these materials elsewhere and they are not the concern of this book.

St Augustine on the human condition, justice, the State, slavery, private property and war: essential sourcebook for historians of late classical and medieval thought. The political and social ideas of St Augustine of Hippo are of central importance to the historian of late classical and medieval political thought: Augustine offers a penetrating critique of the moral and political claims of imperial Rome, and he is one of the founders of the Christian political thought of the middle ages. But the student's task is made difficult by the fact that Augustine did not write a single, systematic political treatise. His political remarks are always incidental to his theological and pastoral concerns; they occur in many different contexts; they have to be dissected out from a great variety of works. In this volume, Dr Dyson brings together an extensive selection of primary sources and provides a detailed commentary on them. The result is a full and wide-ranging narrative account of St Augustine's thinking on the human condition, justice, the State, slavery, private property and war. This comprehensive sourcebook will be of value to students of St Augustine at all levels.Dr R W DYSON lectures in the department of politics, University of Durham.

In recent years various industries have demanded not only greater use of polymeric materials but also the development of polymeric materials with specific properties. Major users include the automotive and transport industries, electrical and electronics industries, and the packaging industry. Following the success of "Speciality Polymers", Dr Dyson's book provides an overview of the main types of polymeric materials used in engineering, and discusses their applications - both practical and potential.

Edition and facing English translation of important Latin text, offering advice for rulers. Sedulius Scottus [fl. ca 850] is an important figure in the early history of European political thought, one of a group of ninth-century authors who produced short treatises in which they attempted to clarify the proper relation between spiritual and secular power. The Latin text of his De rectoribus Christianis [On Christian Rulers] is here presented in a critical edition more complete and accurate than anything hitherto available, with a facing-page English translation. The edition is supported by an Introduction setting it in the context of the general development of political theory in the Christian West. Dr R.W. Dyson was educated at the University of Durham, where he taught the History of Political Thought in the School of Government and International Affairs until his retirement in 2007.

St Augustine of Hippo was the earliest thinker to develop a distinctively Christian political and social philosophy. He does so mainly from the perspective of Platonism and Stoicism; but by introducing the biblical and Pauline conceptions of sin, grace and predestination he radically transforms the 'classical' understanding of the political. Humanity is not perfectible through participation in the life of a moral community; indeed, there are no moral communities on earth. Humankind is fallen; we are slaves of self-love and the destructive impulses generated by it. The State is no longer the matrix within which human beings can achieve ethical goods through co-operation with other rational and moral beings. Augustine's response to classical political assumptions and claims therefore transcends 'normal' radicalism. His project is not that of drawing attention to weaknesses and inadequacies in our political arrangements with a view to recommending their abolition or improvement. Nor does he adopt the classical practice of delineating an ideal State. To his mind, all States are imperfect: they are the mechanisms whereby an imperfect world is regulated. They can provide justice and peace of a kind, but even the best earthly versions of justice and peace are not true justice and peace. It is precisely the impossibility of true justice on earth that makes the State necessary. Robert Dyson's new book describes and analyses this 'transformation' in detail and shows Augustine's enormous influence upon the development of political thought down to the thirteenth century.

Thomas Aquinas (1225-1274) is an extremely influential figure in the history of Western thought and the Catholic church. In this major addition to the Cambridge Texts in the History of Political Thought series, Robert Dyson has translated texts by Aquinas that reflect the complete range of his thinking, and clearly show his development of a Christian version of the philosophy of Aristotle. His translations are supported by brief biographies, notes for further reading and a concise critical introduction.

Giles of Rome was the archbishop of Bourges and a loyal champion of Pope Boniface VIII during the Franco-papal crisis of 1296--1303. "On Ecclesiastical Power" was written at the height of the conflict between Pope Boniface VIII and King Philip IV of France and represents the earliest fully articulated and philosophically developed defense of the "hierocratic" ideology of the medieval papacy. Giles's theory that all government must be legitimized by the pope was based on scriptural, philosophical, patristic, and canonical sources, and his conclusion that the pope is the rightful ruler and final judge of the world -- even in secular matters -- is the definitive statement on papal power in the Middle Ages.

This book offers a new and complete critical edition of the Latin text, based on a collation of five fourteenth-century manuscripts. It is accompanied by a literal English translation and a detailed introduction analyzing the context and content of the treatise. The book takes into account the hitherto unconsidered Cremona manuscript of "On Ecclesiastical Power" and will be indispensable to scholars and students of the history of political thought and international relations.

Thomas Aquinas (1225-1274) is an extremely influential figure in the history of Western thought and the Catholic church. In this major addition to the Cambridge Texts in the History of Political Thought series, Robert Dyson has translated texts by Aquinas that reflect the complete range of his thinking, and clearly show his development of a Christian version of the philosophy of Aristotle. His translations are supported by brief biographies, notes for further reading and a concise critical introduction.