Taken in 1948, this photograph shows the huge rotary kiln (the horizontal pipe leading to the chimney stack) used to bake the lime slurry as part of the cement-making process. Cement is a finely ground, grey mineral powder made of two main materials, lime and clay. When water is added it acts as a glue, and when mixed with sand and aggregate it forms concrete – the most widely used construction material in the world.
Te whakamahi i tēnei tūemi
Alexander Turnbull Library, Tourist and Publicity Department Collection
Reference: 1/2-034181; F
by W. Walker
Permission of the Alexander Turnbull Library, National Library of New Zealand, Te Puna Mātauranga o Aotearoa, must be obtained before any re-use of this image.