Winnowing machines were introduced in the late 1910s. These portable, engine-driven contraptions could achieve around 80% purity in sifting out gum chips – a big improvement over winnowing by hand. These two machines were used at Ahipara between 1910 and 1919.
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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.