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Greymouth Evening Star, 17 April 1939, Page 2

A novel method of making concrete has been adopted in connection with the work on the foundations of the new Auckland Chief Post Office block. By the use of a huge tank many tons of material are mechanically mixed | after being accurately measured according to a Public Works prescripI tion, and the water content, is also carefully controlled. From the tank the liquid concrete is delivered into tanks fitted on motor trucks and is thus transported lo the job. To keep it in the required condition for laying, i lie mixture is agitated by means of an internal combustion engine as the truck moves through the streets. The result, is that when the truck arrives! the' liquid mix is ready to be turned j immediately into Hie troughs which convey it. to the foundations of the building.