A survey has been made of the galactic plane region from l = 223� through the galactic centre to l = 13� between b = +40� and ?6� using the 3�5 m wavelength cross-type aerial (beamwidth 50 min of arc) near Sydney. Contour diagrams of brightness temperature have been prepared. The preparation of contours is described in detail, and a detailed discussion of the accuracy of the temperatures is given.