John Ellis

Through a study of an 'invented' royal ceremony held in Wales in 1911 and again in 1969, "Investiture: Royal Ceremony and National Identity in Wales 1911-1969" explores the problematic, contested and changing relationship between nationality, ethnicity and the state in the United Kingdom. What happens to the meaning of the British monarchy when it leaves the English centre and crosses into the Celtic periphery? How does royal ceremony become a vehicle for defining and contesting the relationship between ethnicity, nationality and the state when it takes place amongst a problematic group like the Welsh? How are internal social and cultural divisions within the periphery represented, addressed and reconciled in such ceremonial? How do these relationships and the constellations of identity that they form change over time? This study explores the ethnic margins and imperial dimensions of British national identity through the ceremonies of the Investiture of the Prince of Wales and the public reaction to them. Through the vehicle of ascribing meaning to this royal ceremony, competing parties and social groups defined alternative and often conflicting models of Welshness and its relationship to British national identity, the British state and the British Empire.

This book starts with an explanation of the phenomenon of pressure transients and how they may arise. It then gives an analysis of the constraints on the magnitude of transient pressures and the need for surge alleviation measures. Equations describing transient motion in pipelines are shown in a straight-forward manner and these are used to introduce the reader to some practical methods of computer analysis in use today. Case studies and assessments of systems and equipment. The author examines a range of case studies involving different types of systems and the types of surge suppression equipment which may be suited to each. Chapters are devoted to various aspects of pipelines which can have a bearing upon pressure transient behaviour. These include flexible pipeline systems and more complicated networks that involve branching and looped pipelines. The presence of air or gas within a system is also dealt with along with considerations for the development of persistent oscillations. Practical, descriptive and enlightening. This practical book provides an indepth analysis of actual systems, with emphasis on the type of hydraulic transient behaviour to be expected in each kind of configuration. Mathematical treatment is covered in a straightforward manner without the need to rely on advanced mathematical skills. Thus, the descriptive nature of this book allows the reader to understand behaviour without constant reference to equations. Due to his extensive experience and insight, the author highlights various pitfalls and provides ideas on when the physical extent of a study can be truncated. Where possible simplified equations are presented to enable rapid assessment of surge equipment capacities – such as those used for pressure vessels, feeder tanks and buffer tanks.