Show highest phone system A telephone exchange three miles in the air said to bo the t highest in a the th world la Is in the observatory atory on oa thi tt tor top of ct nit mt rosa la in th the Appen lue aps ap ia feet abor sc sea level AL ai this degation de ele ration Tation snow to ii always found ud and advantage Is taken of the high insulation lisul attoa given by dry snow the in the tac last section at the peak being amly laid on the snow enow covered gromad gr oui to prevent breakage brea kaea hy ay glacier movements th the line Is id carried through rings on th the telephone poles the poles ure are short and are taken down at the end of 0 every summer season and replaced it at tho the beginning of the following suna euca mer iner |