References in periodicals archive ?
A long-awaited sanitary rock tunnel received city council approval in June with the awarding of the tender to Hamilton's McNally Construction, a leading Canadian tunnelling contractor, for $28.
Tunnelling on the Red Line subway has been halted twice this month, first when the drilling machine called ``Thelma'' hit water, and again when it encountered loose ground, a transit spokesman said Wednesday.
Scientists first convincingly demonstrated the electronic tunnelling phenomenon in semiconductors in the late 1950s, and since that time it has become the basis of several electronic components--among them tunnel diodes, which are good for some amplification and high-speed switching applications.