1942 Egg Incubation Process at Petaluma Hatchery

In January 1942, workers place eggs into an incubator at a hatchery located in Petaluma, Sonoma County, California. The poultry industry in this area thrived due to Lyman Ryces advancements in artificial incubation, which revolutionized egg hatching methods. Petaluma became known as the Egg Capital of the World during this time.

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