Bridge and Tunnel Centres

abutting angle of repose arc of 60 arch stones arrangement back rib backpieces bolt braces Brevet brick bridge centres centre frames centre rib cloth Columbia College constructed cubic foot cubic yard curve dimensions direction Drawing earth engravings equation feet firm points folding wedges full centre arch give hori horizontal beam horizontal tie beam Hypsometry Illustrated inches inclined struts laid latter leading rib length of arch load method mortar NOSTRAND'S PUBLICATIONS patent centres placed Plympton points of support Practical Treatise pressure Prof props queen post radii of curvature radius resistance revised and enlarged scarf joint screws Second edition segment rib side walls sill small span soffit springing line Steam Engine strain strength STRIKING THE CENTRES telegraphy thick tical timbers tion TUNNEL CENTRES U. S. Military Academy U. S. Navy voussoirs Waterloo Bridge weight per cubic William Cain wood cuts