TRACTS

ON

VAULTS AND BRIDGES.

CONTAINING

OBSERVATIONS ON THE VARIOUS

FORMS OF VAULTS;

ON THE

TAKING DOWN AND REBUILDING LONDON BRIDGE ;

AND ON THE

PRINCIPLES OF ARCHES:

ILLUSTRATED BY EXTENSIVE

TABLES OF BRIDGES.

ALSO CONTAINING

THE PRINCIPLES OF PENDENT BRIDGES,

WITH REFERENCE TO THE

PROPERTIES OF TEE CATENARY,

APPLIED TO

THE MENAI BRIDGE.

AND A

THEORETICAL INVESTIGATION OF THE CATENARY.

LONDON :

PRINTED FOR THOMAS AND WILLIAM BOONE, 480. STRAND.SOLD BY

LONGMAN, HURST, REES, ORME, AND BROWN,PATERNOSTER-ROW ;

AND JOSIAH TAYLOR, 59 . HIGH HOLBORN.

1822 .