Sinking Shafts by Freezing

1886 Scientific American  
ltitntuit �mtritan, �fthittd.d and �uitdtt.d �dition. 237 SINKING SHAFTS BY FREEZING. We give the following description from an interest ing article recently published in the Annales des Mines by Mr. Lebreton. The method consists in solidifying in some degree, by freezing, that portion of the moving and watery earth which occupies the position of the projected shaft, so as to permit of excavating therein by hand, without having much pumping to do. To effect
doi:10.1038/scientificamerican06011886-237abuild fatcat:jwcn5djtg5c65d2mf4jfpdsvj4