Document DetailsUniversity of Minnesota Ice Drill
|Periodical/Journal:||Ice-Core Drilling (ed. J.F. Splettstoesser), University of Nebraska Press, Lincoln, NE|
The University of Minnesota ice drill is an electrically-powered, portable, thermal drill designed for boring and coring to depths of a few hundred meters in polar glaciers. A new hot-point design is used in which a cylindrical tip makes an initial hole, and a parabolic section enlarges this hole to the desired diameter. Meltwater produced is diluted with ethylene glycol and left in the hole to counterbalance the hydrostatic pressure in the ice, and thus inhibit hole closure.