THROUGH FOUR-INCH HOLES

New Zealand Herald, Volume LXII, Issue 19201, 15 December 1925, Page 14

THROUGH FOUR-INCH HOLES

material for a tunnel. The old mystery of liow a full-rigged ship got inside a narrow-necked bottle is as nothing to the trick that the New South Wales Railway Commissioners are providing in building the Sydney city railway. In effect, they are building a huge underground concrete tunnel to take two sets of rails through 4in. holes in the surface of Macquarrie Street. Many people wonder what is being done when they see a small boring plant putting down holes in that thoroughfare—holes which are subsequently fenced off from public gaze. Few of them realise that through these small apertures wet concrete is poured right into position in the walls of the city railway tunnel. Working from Hyde Park men are tunnelling under MacqQarie Street. As they go they take the spoil out of the open end of the tunnel arid then erect timber forms in the tunnel to take the concrete. But to avoid the costly process of mixing the concrete in Hyde Park and trucking ; it underground rigtit down as far as Parliament Buildings, they simply bore a hole from the street above until it meets the tunnel and then i>our the mixture I dowu.