Show Electricity to Thaw Ground The electric thawing ground-thawing device used In hi Alaskan mil railroad road building has hashe the he form torm of ot a hollow steel pile This has ms a sharpened steel point at one end and a solid soUd steel driving head at the theother theother theother other and ond the hollow body contains a suitable resistance coil coll The pointed point point- ed tube Is driven like any pile pUe Into the he frozen ground to the required I depth Connection is then made with witha I a power transmission line through a aK portable K transformer mounted on a sledge and a II volt low current of high amperage Is passed through the coil The Che heat soon thaws the s surrounding ground sufficiently for driving a wooden wood wood- en pile |