roof supports
61tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …
62COLUMN — Columns developed as ornate, cylindrical posts that functioned as part of the post and lintel structural system. These pillars were originally modeled after trees or other forms of upright vegetation. A column is typically divided into three… …
63Electric arc furnace — An electric arc furnace (EAF) is a furnace that heats charged material by means of an electric arc. Arc furnaces range in size from small units of approximately one ton capacity (used in foundries for producing cast iron products) up to about 400 …
64art conservation and restoration — Maintenance and preservation of works of art, their protection from future damage, deterioration, or neglect, and the repair or renovation of works that have deteriorated or been damaged. Research in art history has relied heavily on 20th and… …
65Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations …
66Dome — For other uses, see Dome (disambiguation). Domal redirects here. For domal consonants , see Retroflex consonant. Dome of St. Peter s Basilica in Rome crowned by a cupola. Designed primarily by Michelangelo, the dome was not completed until 1590 A …
67Timber framing — (German: Fachwerk literally framework ), or half timbering, and in North America Post and Beam construction is the method of creating structures using heavy squared off and carefully fitted and joined timbers with joints secured by large wooden… …
68Central Asian arts — Literary, performing, and visual arts of Afghanistan, Azerbaijan, Kazakhstan, Kyrgyzstan, Mongolia, Nepal, Tibet, Turkmenistan, Uzbekistan, and parts of China and Russia. The term usually denotes only those traditions not influenced by the… …
69Ecclesiastical Architecture — • All ecclesiastical architecture may be said to have been evolved from two distinct germ cells, the oblong and the circular chamber Catholic Encyclopedia. Kevin Knight. 2006. Ecclesiastical Architecture Ecclesiastic …
70Ligament — A ligament is a tough band of connective tissue that connects various structures such as two bones. Ligament is a fitting term; it comes from the Latin ligare meaning to bind or tie. * * * 1. A band or sheet of fibrous tissue connecting two or… …
