Text-Book on Roofs and Bridges

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Parts I. II, and III of this text-book are devoted almost entirely to framed structures having two supports whose reac tions are vertical. These probably constitute more than ninety per cent of all roof and bridge trusses, and hence should claim the greater part of the time of the student. In this volume are discussed those structures which have more than two supports, as continuous, draw and cantilever bridges, or which have two supports whose reactions are not vertical, as the suspension and arched systems.