Show rapid tunnel boring machine there has hag recently been invented a machino machine for boring into the rock and making tunnels in an extraordinarily rapid way in addition to the rapid opening of ground for tho the more economical development of veins it will remove the necessity in m many a ny instances to provide outlets tor for the water this machine it Is claimed will cut a holo eight feet in diameter and make five feet per hour hopr it is claimed that it will cut from 25 to 80 lineal feet per day of 24 hours fours bulletin international finance assoil aaion mexico |