Not weird, helmeted men from Mars, but merely airplane mechanics carrying metal propeller-hub protectors were pictured in the curious photograph here in 1939. Because of their unwieldy shape, the hub spinners were easier to carry when held over the heads of the workmen as they walked out to install them on giant 1,200-horsepower transport-plane motors. The spinners help prevent the formation of ice on propeller hubs during winter and early-spring flying.
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