hyperboloid structures
...that hyperboloid structures in architecture are doubly-curved surfaces that may be formed entirely from a lattice of straight angle-iron and flat iron bars?
...that <b id="mwYg"><a class="mw-redirect" href="./Hyperboloid_structures" id="mwYw" rel="mw:WikiLink" title="Hyperboloid structures">hyperboloid structures</a></b> in <a href="./Architecture" id="mwZA" rel="mw:WikiLink" title="Architecture">architecture</a> are doubly-curved surfaces that may be formed entirely from a <a href="./Crystal_structure" id="mwZQ" rel="mw:WikiLink" title="Crystal structure">lattice</a> of straight angle-iron and flat iron bars?