crushed timbering
1Philip Deidesheimer — (1832 1916) invented a system of supports for mines, using heavy timber cubes now known as square set timbering , that enabled skilled miners to open three dimensional cavities of any size underground. Deidesheimer created the system for the… …
2Mining — This article is about the extraction of geological materials from the Earth. For the municipality in Austria, see Mining, Austria. For the siege tactic, see Mining (military). For name of the Chinese emperor, see Daoguang Emperor. Simplified… …
3Johannesburg — /joh han is berrg , hah nis /; Du. /yoh hahn euhs buerddkh /, n. a city in S Transvaal, in the NE Republic of South Africa. 1,441,000. * * * City (pop., 1996: metro. area, 1,480,530), northeastern South Africa. One of the country s largest cities …
4Mining in the Upper Harz — The headframe of the Emperor William Shaft in Clausthal is one of the oldest surviving winding towers in Germany …
