These eggs are being warmed in an early incubator. The development of incubators to artificially hatch eggs under controlled temperatures allowed the mass production of chickens. Hens did not have to be taken out of egg-laying for the three weeks needed to incubate the eggs.
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Archives New Zealand - Te Rua Mahara o te Kāwanatanga
Reference: AANR 6329 60 A46715
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