CONTENTS.
TRACT I.
OBSERVATIONS ON VAULTS.
Introduction ... Page 1
Of Cylindrical Vaults - - - 5
Of Groined Vaults - - - - 13
Of Pyramidal Vaults - - - 34
Historical Sketch of Vaults - - ■ - 36
Of Groined Ribbed Vaults - - - 49
Of Ribbed Vaults, by Ribs of the same Curvature - 57
Of Pendent Ribbed Vaults - - 67
Observations on the Origin of the Principal Features ofDecorative Architecture - - - 69
TRACT II.
OBSERVATIONS RESPECTING THE TAKING DOWN ANDREBUILDING LONDON BRIDGE .
On the New Bridge - - Page 1
On the Effects of increasing the Waterway of London Bridge 3Observations relative to the Principles of Bridges - 9
Authorities, Formula; - - - - 17
Table of the Spans of Arches, being the Sides of EquilateralFigures inscribed in Circles , and the Versed Sines of suchArches - - - - 19
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