This is a Taylor Form 99080 weather forecast computer, copyrighted in 1950. It’s printed on card material and measures 4 x 4 inches. The front side is used for a rising or steady barometer, while the rear side is used for a falling barometer. Depending on the barometer reading, the central disk is turned until the arrowhead points to the wind direction. The weather forecast is then read in the appropriate slot, depending on the barometric rate of change.

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