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With 12 self-sealing bottles such as this, Erik Gustaf Moberg took samples of water to depths of 20,000 feet in the Pacific, and measured the extent of the "Dead Area." This picture shows the bottle swinging down from its upright position. Thermometers are contained in the glass tube on its side. Not dated

With 12 self-sealing bottles such as this, Erik Gustaf Moberg took samples of water to depths of 20,000 feet in the Pacifi...