CONTENTS Acknowledgements viii Preface ix-xi 1 Intuition and the springs of stuctural invention 1-48 Structures Implicit and Explicit, ed. J. Bryan and R. Sauer, VIA, Publications of the Graduate School of Fine Arts, University of Pennsylvania, vol. 2 (Philadelphia, 1973), pp. 47-67, 193-194 2 The springs of invention revisited 49-73 The Structural Engineer 73, no. 22 (1995), pp. 392-399 3 The role of tradition in the development of form in domes, shells, and space structures 75-80 Opening address at the 1978 symposium of the International Association of Shell and Space Structures, University of West Virginia 4 Structural theory and design before 1742 81-109 Architectural Review 143 (1968), pp. 303-310 5 Developments in structural design since the seventeenth century especially in Britain 111-122 Edited version of 'Introduction' in Structural Engineering : Two Centuries of British Achievement, Anniversary Publication of the Institution of Structural Engineers, ed. A.R. Collins (London, 1983), pp. 5-26 6 Structural analysis, structural insights, and historical interpretation 123-147 Journal of the Society of Architectural Historians 56, no. 3 (1997), pp. 316-339 7 On the stucture of the Roman Pantheon 149-152 Art Bulletin 68, no. 4 (1986), pp. 672-673, with introductory note and explanatory drawing 8 The structure of the church of St Sophia, Istanbul 153-186 Transactions of the Newcomen Society 38 (1965/66), pp. 23-49 9 The reconstruction of the tympana of St Sophia at Istanbul 187-207 Dumbarton Oaks Papers 23/24 (1969/70), pp. 355-368 10 Hagia Sophia: Justinian's Church of Divine Wisdom, later the Mosque of Ayasofya, in Istanbul 209-228 The Structural Engineer 68, no. 4 (1990), pp. 65-71 11 Hagia Sophia's first dome 229-232 Journal of the Society of Architectural Historians 55, no. 3 (1996), pp. 360-362, with explanatory drawing 12 The structural conservation of Hagia Sophia : past history and present needs 233-242 Abridged version of the opening paper, 'The structural conservation of Hagia Sophia', presented at the third conference on the Structural Repair and Maintenance of Historical Buildings, Computational Mechanics Publications (Southampton/Boston, 1993), pp. 3-14 13 The first and second churches of San Marco reconsidered 243-257 The Antiquaries Journal 71 (1991), 123-137 14 Squinches and pedentives: comments on problems of definition 259-270 Art and Archaeology Research Papers 4 (1973), pp. 131-137, with additional drawings 15 Westminster Hall roof 271-278 Proceedings of the Institution of Civil Engineers 38 (1967), 788-792, with introductory note andadditonal figures 16 Brunelleschi's dome of S. Maria del Fiore and some related structures 279-304 Transactions of the Newcomen Society 42 (1969/70), pp. 107-126 17 Brunelleschi's dome 305-326 Architectural Review 162, no. 967 (1977), pp. 156-166, 320 18 The dome of St Peter's: structural aspects of its design and construction and inquiries into its stability 327-350 Expanded version of the main part of a paper presented at the Architectural Association symposium on the dome, London, 1991 Sinan's Suleymaniye Mosque and Justinian's Hagia Sophia 351-359 Paper presented at the 1993 symposium of the International Association of Shell and Space Structures, Mimar Sinan University, Istanbul, 1993, pp. 53-62, with additional illustrations 20 Designs for ribbed vaults by Guarini and Leonardo 361-364 Architectural Review 147 (1970), p. 454, with additional illustrations 21 The reinforced flat arches of the east colonnade of the Louvre 365-379 Chapter VI, 'Materials and structure', written with R. W. Berger, in The Palace of the Sun: The Louvre of Louis XIV, R. W. Berger (Pennsylvania, 1993), pp. 65-74, with introductory note and additional illustrations 22 The Eddystone Lighthouse 381-403 John Smeaton FRS, ed. A. W. Skempton (London, 1981), pp. 83-102, 264-266 Additional notes and comments 405-410 Index of subj ects 411-415 Index of buildings 417-420 Index of persons 421-423 ERRATUM p. 327, col. 2,1. 19: for Rosellino read Rossellino. p. 329, col. 1,1. II: for Giuliano di Sangallo readGiuliano da Sangallo. p. 329, col. 1,1. 23: for Antonio di Sangallo read Antonio da Sangallo. p. 332, col. 1,1. 14:/orRosellino'sra/Rossellino's. p. 345, col. 2,1. 27:/or libri (45 kN) rearflibbre (45 MN). p. 423, col. 1,1. 15:/or Rosellino read Rossellino. p. 423, col. 1,1. 26: for Sangallo, Antonio di read Sangallo, Antonio da. p. 423, col. 1,1. 28: for Sangallo, Giuliano di read Sangallo, Giuliano da.